Hello,
1. Unfortunately, at the moment it is not supported.
2. Only manually, I am afraid. You can go to Edit Even > Publish > enable Event Completed or Cancel Event.
You can send us a customization job request by creating a new ticket in here and selecting Customization Request as the category.
Ashish has accepted the job for 500
Ashish has accepted the job for 200
Solved it. Didn’t realize where the shortcode generator was. Found that, and was able to solve my dilemma.
Thanks, Great plugin.

Did the same on our test server and it worked correctly: http://dev2.myeventon.com/events/rsvp-cap
Are you sure that your version of RSVP is 2.6.5?
We are glad your issue is resolved, if you have any further questions or concerns please create a new ticket.
I went there and try to fix but nothing