New activity/session being added, activity date restricted by event dates #123
Description
The api needs to verify that the dates set on a new activity/session fall within the start and stop dates of that event.
- If the activity is not approved or active it may have no dates
- if the activity is active it must have a startTime between the start and end dates of the event
- Not sure on rule for approved as it may not be scheduled yet, which is fine for now.
related to THAT.us issue: ThatConference/that.us#594