Create event

POST https://graph.microsoft.com/beta/groups/01d4ee64-15ce-491e-bad1-b91aa3223df4/events
Content-type: application/json

{
  "subject": "Let's go for lunch",
  "body": {
    "contentType": "HTML",
    "content": "Does late morning work for you?"
  },
  "start": {
      "dateTime": "2019-06-15T12:00:00",
      "timeZone": "Pacific Standard Time"
  },
  "end": {
      "dateTime": "2019-06-15T14:00:00",
      "timeZone": "Pacific Standard Time"
  },
  "location":{
      "displayName":"Harry's Bar"
  },
  "attendees": [
    {
      "emailAddress": {
        "address":"adelev@contoso.onmicrosoft.com",
        "name": "Adele Vance"
      },
      "type": "required"
    }
  ]
}

GraphServiceClient graphClient = new GraphServiceClient( authProvider );

var @event = new Event
{
	Subject = "Let's go for lunch",
	Body = new ItemBody
	{
		ContentType = BodyType.Html,
		Content = "Does late morning work for you?"
	},
	Start = new DateTimeTimeZone
	{
		DateTime = "2019-06-15T12:00:00",
		TimeZone = "Pacific Standard Time"
	},
	End = new DateTimeTimeZone
	{
		DateTime = "2019-06-15T14:00:00",
		TimeZone = "Pacific Standard Time"
	},
	Location = new Location
	{
		DisplayName = "Harry's Bar"
	},
	Attendees = new List<Attendee>()
	{
		new Attendee
		{
			EmailAddress = new EmailAddress
			{
				Address = "adelev@contoso.onmicrosoft.com",
				Name = "Adele Vance"
			},
			Type = AttendeeType.Required
		}
	}
};

await graphClient.Groups["01d4ee64-15ce-491e-bad1-b91aa3223df4"].Events
	.Request()
	.AddAsync(@event);

const options = {
	authProvider,
};

const client = Client.init(options);

const event = {
  subject: "Let's go for lunch",
  body: {
    contentType: "HTML",
    content: "Does late morning work for you?"
  },
  start: {
      dateTime: "2019-06-15T12:00:00",
      timeZone: "Pacific Standard Time"
  },
  end: {
      dateTime: "2019-06-15T14:00:00",
      timeZone: "Pacific Standard Time"
  },
  location:{
      displayName:"Harry's Bar"
  },
  attendees: [
    {
      emailAddress: {
        address:"adelev@contoso.onmicrosoft.com",
        name: "Adele Vance"
      },
      type: "required"
    }
  ]
};

let res = await client.api('/groups/01d4ee64-15ce-491e-bad1-b91aa3223df4/events')
	.version('beta')
	.post(event);

MSHTTPClient *httpClient = [MSClientFactory createHTTPClientWithAuthenticationProvider:authenticationProvider];

NSString *MSGraphBaseURL = @"https://graph.microsoft.com/beta/";
NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:[MSGraphBaseURL stringByAppendingString:@"/groups/01d4ee64-15ce-491e-bad1-b91aa3223df4/events"]]];
[urlRequest setHTTPMethod:@"POST"];
[urlRequest setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];

MSGraphEvent *event = [[MSGraphEvent alloc] init];
[event setSubject:@"Let's go for lunch"];
MSGraphItemBody *body = [[MSGraphItemBody alloc] init];
[body setContentType: [MSGraphBodyType html]];
[body setContent:@"Does late morning work for you?"];
[event setBody:body];
MSGraphDateTimeTimeZone *start = [[MSGraphDateTimeTimeZone alloc] init];
[start setDateTime: "2019-06-15T12:00:00"];
[start setTimeZone:@"Pacific Standard Time"];
[event setStart:start];
MSGraphDateTimeTimeZone *end = [[MSGraphDateTimeTimeZone alloc] init];
[end setDateTime: "2019-06-15T14:00:00"];
[end setTimeZone:@"Pacific Standard Time"];
[event setEnd:end];
MSGraphLocation *location = [[MSGraphLocation alloc] init];
[location setDisplayName:@"Harry's Bar"];
[event setLocation:location];
NSMutableArray *attendeesList = [[NSMutableArray alloc] init];
MSGraphAttendee *attendees = [[MSGraphAttendee alloc] init];
MSGraphEmailAddress *emailAddress = [[MSGraphEmailAddress alloc] init];
[emailAddress setAddress:@"adelev@contoso.onmicrosoft.com"];
[emailAddress setName:@"Adele Vance"];
[attendees setEmailAddress:emailAddress];
[attendees setType: [MSGraphAttendeeType required]];
[attendeesList addObject: attendees];
[event setAttendees:attendeesList];

NSError *error;
NSData *eventData = [event getSerializedDataWithError:&error];
[urlRequest setHTTPBody:eventData];

MSURLSessionDataTask *meDataTask = [httpClient dataTaskWithRequest:urlRequest 
	completionHandler: ^(NSData *data, NSURLResponse *response, NSError *nserror) {

		//Request Completed

}];

[meDataTask execute];

IGraphServiceClient graphClient = GraphServiceClient.builder().authenticationProvider( authProvider ).buildClient();

Event event = new Event();
event.subject = "Let's go for lunch";
ItemBody body = new ItemBody();
body.contentType = BodyType.HTML;
body.content = "Does late morning work for you?";
event.body = body;
DateTimeTimeZone start = new DateTimeTimeZone();
start.dateTime = "2019-06-15T12:00:00";
start.timeZone = "Pacific Standard Time";
event.start = start;
DateTimeTimeZone end = new DateTimeTimeZone();
end.dateTime = "2019-06-15T14:00:00";
end.timeZone = "Pacific Standard Time";
event.end = end;
Location location = new Location();
location.displayName = "Harry's Bar";
event.location = location;
LinkedList<Attendee> attendeesList = new LinkedList<Attendee>();
Attendee attendees = new Attendee();
EmailAddress emailAddress = new EmailAddress();
emailAddress.address = "adelev@contoso.onmicrosoft.com";
emailAddress.name = "Adele Vance";
attendees.emailAddress = emailAddress;
attendees.type = AttendeeType.REQUIRED;
attendeesList.add(attendees);
event.attendees = attendeesList;

graphClient.groups("01d4ee64-15ce-491e-bad1-b91aa3223df4").events()
	.buildRequest()
	.post(event);