[Creating new events using API]

Thank you for the example, I used the code you provided by was I see no new event in the "Overview". Whe trying to debug the issue I got "Duplicate entry"

Here is the json used for my test:

[{"action": "create", 
  "entity_data": {
    "__entity_type__": "CalendarEvent", 
    "end": {"__type__": "datetime", "value": "2017-07-21T23:59:59+00:00"}, 
    "id": "0a645dfc-76c0-55e1-a052-5db8246fb86c", 
    "name": "Random title used for test", 
    "start": {"__type__": "datetime", "value": "2017-07-20T00:00:00+00:00"}}, 
  "entity_key": ["0a645dfc-76c0-44e1-a052-5db8246fb86c"], 
  "entity_type": "CalendarEvent"}]

And the response:

{
"content": "(_mysql_exceptions.IntegrityError) (1062, "Duplicate entry '0a645dfc-76c0-44e1-a052-5db8246fb86c' for key 'PRIMARY'") [SQL: u'INSERT INTO calendar_event (name, start, end, `leave`, everyone, forecast, estimate, effort, project_id, type_id, id, created_by_id, created_at) VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s)'] [parameters: ('Random title used for test', datetime.datetime(2017, 7, 20, 0, 0), datetime.datetime(2017, 7, 21, 23, 59, 59), 0, 0, 0, 0.0, 0.0, None, None, u'0a645dfc-76c0-44e1-a052-5db8246fb86c', 'abb865c6-d666-11e5-a91d-0026b94baeec', datetime.datetime(2017, 7, 20, 17, 49, 14, 499195))]",
"exception": "IntegrityError",
"error_code": null
}

Which means the event DOES exist, but I am unable to see it. When I try to list the CalendarEvents of the project, the new one does not appear. Also, when I try to update the dates of an existing event I get 

{"content": "'NoneType' object has no attribute 'date'", "exception": "AttributeError", "error_code": null}

[Creating new events using API]

I am trying to create a new Calendar Event using the api, but I think this is not currently being supported.

The old api had a project.createPhase() method which is the one I am testing to create this entity. 

Is this the correct way to approach the creation of events through the api?

FYI: I am currently using the 3.5 (latest) ftrack api for python.