Adds an Event

If you have trouble with creating an Event, try creating Events via the web interface, and then access those Events via the API. This way you can see examples of the fields and sub-elements attached to the Event. A common source of problems during write/update request is caused when users omit required fields, or insert invalid data in a field (e.g. reference a CATEGORY_ID that does not exist in the user's Insightly instance.