diff --git a/lib/jmap/core/method/request/calendar_event_reply_method.dart b/lib/jmap/core/method/request/calendar_event_reply_method.dart
new file mode 100644
index 0000000..286faea
--- /dev/null
+++ b/lib/jmap/core/method/request/calendar_event_reply_method.dart
@@ -0,0 +1,26 @@
+import 'package:jmap_dart_client/jmap/core/id.dart';
+import 'package:jmap_dart_client/jmap/core/method/method.dart';
+import 'package:json_annotation/json_annotation.dart';
+
+abstract class CalendarEventReplyMethod extends MethodRequiringAccountId
+  with OptionalLanguage {
+  CalendarEventReplyMethod(
+    super.accountId,
+    {
+      required this.blobIds,
+    });
+
+  final List<Id> blobIds;
+
+  @override
+  List<Object?> get props => [accountId, blobIds, language];
+}
+
+mixin OptionalLanguage {
+  @JsonKey(includeIfNull: false)
+  String? language;
+
+  void addLanguage(String value) {
+    language = value;
+  }
+}
\ No newline at end of file
diff --git a/lib/jmap/core/method/response/calendar_event_reply_response.dart b/lib/jmap/core/method/response/calendar_event_reply_response.dart
new file mode 100644
index 0000000..dd206ee
--- /dev/null
+++ b/lib/jmap/core/method/response/calendar_event_reply_response.dart
@@ -0,0 +1,11 @@
+import 'package:jmap_dart_client/jmap/core/id.dart';
+import 'package:jmap_dart_client/jmap/core/method/method_response.dart';
+
+abstract class CalendarEventReplyResponse extends ResponseRequiringAccountId {
+  CalendarEventReplyResponse(super.accountId, this.notFound);
+
+  final List<Id>? notFound;
+
+  @override
+  List<Object?> get props => [accountId, notFound];
+}
\ No newline at end of file
diff --git a/lib/jmap/mail/calendar/reply/calendar_event_accept_method.dart b/lib/jmap/mail/calendar/reply/calendar_event_accept_method.dart
new file mode 100644
index 0000000..cd35a05
--- /dev/null
+++ b/lib/jmap/mail/calendar/reply/calendar_event_accept_method.dart
@@ -0,0 +1,28 @@
+import 'package:jmap_dart_client/http/converter/account_id_converter.dart';
+import 'package:jmap_dart_client/http/converter/id_converter.dart';
+import 'package:jmap_dart_client/jmap/core/capability/capability_identifier.dart';
+import 'package:jmap_dart_client/jmap/core/method/request/calendar_event_reply_method.dart';
+import 'package:jmap_dart_client/jmap/core/request/request_invocation.dart';
+import 'package:json_annotation/json_annotation.dart';
+
+part 'calendar_event_accept_method.g.dart';
+
+@JsonSerializable(converters: [
+  AccountIdConverter(),
+  IdConverter(),
+])
+class CalendarEventAcceptMethod extends CalendarEventReplyMethod {
+  CalendarEventAcceptMethod(super.accountId, {required super.blobIds});
+
+  @override
+  MethodName get methodName => MethodName('CalendarEvent/accept');
+
+  @override
+  Set<CapabilityIdentifier> get requiredCapabilities => {
+    CapabilityIdentifier.jmapCore,
+    CapabilityIdentifier.jamesCalendarEvent
+  };
+
+  @override
+  Map<String, dynamic> toJson() => _$CalendarEventAcceptMethodToJson(this);
+}
\ No newline at end of file
diff --git a/lib/jmap/mail/calendar/reply/calendar_event_accept_method.g.dart b/lib/jmap/mail/calendar/reply/calendar_event_accept_method.g.dart
new file mode 100644
index 0000000..7df081a
--- /dev/null
+++ b/lib/jmap/mail/calendar/reply/calendar_event_accept_method.g.dart
@@ -0,0 +1,33 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'calendar_event_accept_method.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+CalendarEventAcceptMethod _$CalendarEventAcceptMethodFromJson(
+        Map<String, dynamic> json) =>
+    CalendarEventAcceptMethod(
+      const AccountIdConverter().fromJson(json['accountId'] as String),
+      blobIds: (json['blobIds'] as List<dynamic>)
+          .map((e) => const IdConverter().fromJson(e as String))
+          .toList(),
+    )..language = json['language'] as String?;
+
+Map<String, dynamic> _$CalendarEventAcceptMethodToJson(
+    CalendarEventAcceptMethod instance) {
+  final val = <String, dynamic>{
+    'accountId': const AccountIdConverter().toJson(instance.accountId),
+  };
+
+  void writeNotNull(String key, dynamic value) {
+    if (value != null) {
+      val[key] = value;
+    }
+  }
+
+  writeNotNull('language', instance.language);
+  val['blobIds'] = instance.blobIds.map(const IdConverter().toJson).toList();
+  return val;
+}
diff --git a/lib/jmap/mail/calendar/reply/calendar_event_accept_response.dart b/lib/jmap/mail/calendar/reply/calendar_event_accept_response.dart
new file mode 100644
index 0000000..a621dd1
--- /dev/null
+++ b/lib/jmap/mail/calendar/reply/calendar_event_accept_response.dart
@@ -0,0 +1,29 @@
+import 'package:jmap_dart_client/jmap/core/id.dart';
+import 'package:jmap_dart_client/jmap/core/method/response/calendar_event_reply_response.dart';
+import 'package:jmap_dart_client/jmap/mail/calendar/properties/event_id.dart';
+import 'package:jmap_dart_client/util/json_parsers.dart';
+
+class CalendarEventAcceptResponse extends CalendarEventReplyResponse {
+  CalendarEventAcceptResponse(
+    super.accountId,
+    super.notFound,
+    {
+      this.accepted,
+      this.notCreated
+    });
+
+  final List<EventId>? accepted;
+  final List<Id>? notCreated;
+
+  static CalendarEventAcceptResponse deserialize(Map<String, dynamic> json) {
+    return CalendarEventAcceptResponse(
+      JsonParsers().parsingAccountId(json),
+      JsonParsers().parsingListId(json, 'notFound'),
+      accepted: JsonParsers().parsingListEventId(json, 'accepted'),
+      notCreated: JsonParsers().parsingListId(json, 'notCreated'),
+    );
+  }
+
+  @override
+  List<Object?> get props => [...super.props, accepted, notCreated];
+}
\ No newline at end of file
diff --git a/lib/util/json_parsers.dart b/lib/util/json_parsers.dart
new file mode 100644
index 0000000..fedd0c5
--- /dev/null
+++ b/lib/util/json_parsers.dart
@@ -0,0 +1,42 @@
+import 'package:jmap_dart_client/http/converter/account_id_converter.dart';
+import 'package:jmap_dart_client/http/converter/calendar/event_id_nullable_converter.dart';
+import 'package:jmap_dart_client/http/converter/id_converter.dart';
+import 'package:jmap_dart_client/jmap/account_id.dart';
+import 'package:jmap_dart_client/jmap/core/id.dart';
+import 'package:jmap_dart_client/jmap/mail/calendar/properties/event_id.dart';
+
+class JsonParsers {
+  const JsonParsers._();
+  factory JsonParsers() => _instance;
+  static const JsonParsers _instance = JsonParsers._();
+
+  AccountId parsingAccountId(Map<String, dynamic> json) {
+    return const AccountIdConverter().fromJson(json['accountId'] as String);
+  }
+  
+  List<Id>? parsingListId(Map<String, dynamic> json, String key) {
+    final jsonListIds = json[key];
+
+    if (jsonListIds == null) return null;
+
+    if (jsonListIds.runtimeType != List<String>) return null;
+
+    return (jsonListIds as List<String>)
+      .map((value) => const IdConverter().fromJson(value))
+      .toList();
+  }
+
+  List<EventId>? parsingListEventId(Map<String, dynamic> json, String key) {
+    final jsonListIds = json[key];
+
+    if (jsonListIds == null) return null;
+
+    if (jsonListIds.runtimeType != List<String>) return null;
+
+    return (jsonListIds as List<String>)
+      .map((value) => const EventIdNullableConverter().fromJson(value))
+      .where((element) => element != null)
+      .cast<EventId>()
+      .toList();
+  }
+}
\ No newline at end of file
diff --git a/test/jmap/mail/calendar/reply/calendar_event_accept_method_test.dart b/test/jmap/mail/calendar/reply/calendar_event_accept_method_test.dart
new file mode 100644
index 0000000..6c94b61
--- /dev/null
+++ b/test/jmap/mail/calendar/reply/calendar_event_accept_method_test.dart
@@ -0,0 +1,89 @@
+import 'package:dio/dio.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:http_mock_adapter/http_mock_adapter.dart';
+import 'package:jmap_dart_client/http/http_client.dart';
+import 'package:jmap_dart_client/jmap/account_id.dart';
+import 'package:jmap_dart_client/jmap/core/id.dart';
+import 'package:jmap_dart_client/jmap/core/method/request/calendar_event_reply_method.dart';
+import 'package:jmap_dart_client/jmap/core/method/response/calendar_event_reply_response.dart';
+import 'package:jmap_dart_client/jmap/core/request/request_invocation.dart';
+import 'package:jmap_dart_client/jmap/jmap_request.dart';
+import 'package:jmap_dart_client/jmap/mail/calendar/properties/event_id.dart';
+import 'package:jmap_dart_client/jmap/mail/calendar/reply/calendar_event_accept_method.dart';
+import 'package:jmap_dart_client/jmap/mail/calendar/reply/calendar_event_accept_response.dart';
+
+void main() {
+  final baseOption = BaseOptions(method: 'POST');
+  final dio = Dio(baseOption)..options.baseUrl = 'http://domain.com/jmap';
+  final dioAdapter = DioAdapter(dio: dio);
+  final dioAdapterHeaders = {"accept": "application/json;jmapVersion=rfc-8621"};
+  final httpClient = HttpClient(dio);
+  final processingInvocation = ProcessingInvocation();
+  final requestBuilder = JmapRequestBuilder(httpClient, processingInvocation);
+  final accountId = AccountId(Id('123abc'));
+  final successBlobId = Id('abc123');
+  final failureBlobId = Id('def456');
+  final notFoundBlobId = Id('ghi789');
+  final blobIds = [successBlobId, failureBlobId, notFoundBlobId];
+  final methodCallId = MethodCallId('c0');
+
+  Map<String, dynamic> constructData(CalendarEventReplyMethod method) => {
+    "using": method.requiredCapabilities
+      .map((capability) => capability.value.toString())
+      .toList(),
+    "methodCalls": [
+      [
+        method.methodName.value,
+        {
+          "accountId": accountId.id.value,
+          "blobIds": blobIds.map((id) => id.value).toList(),
+        },
+        methodCallId.value
+      ]
+    ]
+  };
+
+  Map<String, dynamic> constructResponse(CalendarEventReplyMethod method) => {
+    "sessionState": "abcdefghij",
+    "methodResponses": [[
+      method.methodName.value,
+      {
+        "accountId": accountId.id.value,
+        "accepted": [successBlobId.value],
+        "notCreated": [failureBlobId.value],
+        "notFound": [notFoundBlobId.value],
+      },
+      methodCallId.value
+    ]]
+  };
+
+  group('calendar event accept method', () {
+    final method = CalendarEventAcceptMethod(accountId, blobIds: blobIds);
+
+    test('should succeed with success blob data, '
+    'and fail with failure blob data '
+    'and not found with not found blob data', () async {
+      // arrange
+      final invocation = requestBuilder.invocation(method, methodCallId: methodCallId);
+      dioAdapter.onPost(
+        '',
+        (server) => server.reply(200, constructResponse(method)),
+        data: constructData(method),
+        headers: dioAdapterHeaders,
+      );
+
+      // act
+      final response = (await (requestBuilder..usings(method.requiredCapabilities))
+        .build()
+        .execute())
+          .parse<CalendarEventReplyResponse>(
+            invocation.methodCallId,
+            CalendarEventAcceptResponse.deserialize);
+      
+      // assert
+      expect((response as CalendarEventAcceptResponse?)?.accepted, equals([EventId(successBlobId.value)]));
+      expect(response?.notCreated, equals([failureBlobId]));
+      expect(response?.notFound, equals([notFoundBlobId]));
+    });
+  });
+}
\ No newline at end of file
diff --git a/test/util/json_parsers_test.dart b/test/util/json_parsers_test.dart
new file mode 100644
index 0000000..1d61fcf
--- /dev/null
+++ b/test/util/json_parsers_test.dart
@@ -0,0 +1,118 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:jmap_dart_client/jmap/account_id.dart';
+import 'package:jmap_dart_client/jmap/core/id.dart';
+import 'package:jmap_dart_client/jmap/mail/calendar/properties/event_id.dart';
+import 'package:jmap_dart_client/util/json_parsers.dart';
+
+void main() {
+  final jsonParsers = JsonParsers();
+
+  group('json parsers test:', () {
+    group('parse account id test:', () {
+      test('should return account id when json contains account id',() {
+        // arrange
+        const rawAccountId = 'abc123';
+        final json = {'accountId': rawAccountId};
+
+        // act
+        final accountId = jsonParsers.parsingAccountId(json);
+
+        // assert
+        expect(accountId, AccountId(Id(rawAccountId)));
+      });
+
+      test('should throw TypeError exception when json doesn\'t contains account id',() {
+        // arrange
+        final json = <String, dynamic>{};
+
+        // assert
+        expect(
+          () => jsonParsers.parsingAccountId(json),
+          throwsA(isA<TypeError>()));
+      });
+
+      test('should throw TypeError exception when accountId json is not String',() {
+        // arrange
+        const rawAccountId = 'abc123';
+        final json = {'accountId': [rawAccountId]};
+
+        // assert
+        expect(
+          () => jsonParsers.parsingAccountId(json),
+          throwsA(isA<TypeError>()));
+      });
+    });
+
+    group('parse list id test:', () {
+      test('should return list id when json contains list id',() {
+        // arrange
+        const rawListId = ['abc123'];
+        final json = {'listId': rawListId};
+
+        // act
+        final listId = jsonParsers.parsingListId(json, 'listId');
+
+        // assert
+        expect(listId, rawListId.map((id) => Id(id)).toList());
+      });
+
+      test('should return null when json doesn\'t contains list id',() {
+        // arrange
+        final json = <String, dynamic>{};
+
+        // act
+        final listId = jsonParsers.parsingListId(json, 'listId');
+
+        // assert
+        expect(listId, null);
+      });
+
+      test('should return null when list id json is not List<String>',() {
+        // arrange
+        final json = {'listId': 'abc123'};
+
+        // act
+        final listId = jsonParsers.parsingListId(json, 'listId');
+
+        // assert
+        expect(listId, null);
+      });
+    });
+
+    group('parse list event id test:', () {
+      test('should return list event id when json contains list event id',() {
+        // arrange
+        const rawListEventId = ['abc123'];
+        final json = {'listEventId': rawListEventId};
+
+        // act
+        final listEventId = jsonParsers.parsingListEventId(json, 'listEventId');
+
+        // assert
+        expect(listEventId, rawListEventId.map((id) => EventId(id)).toList());
+      });
+
+      test('should return null when json doesn\'t contains list event id',() {
+        // arrange
+        final json = <String, dynamic>{};
+
+        // act
+        final listEventId = jsonParsers.parsingListEventId(json, 'listEventId');
+
+        // assert
+        expect(listEventId, null);
+      });
+
+      test('should return null when list event id json is not List<String>',() {
+        // arrange
+        final json = {'listEventId': 'abc123'};
+
+        // act
+        final listEventId = jsonParsers.parsingListEventId(json, 'listEventId');
+
+        // assert
+        expect(listEventId, null);
+      });
+    });
+  });
+}
\ No newline at end of file