Haven't seen anything about an event cancel API. An API that functions exactly the same as website CANCEL would be perfect. (See my original post on 4/29/15.)
My events (astronomy) are often canceled due to bad weather.
I can't use DELETE because DELETE removes the event from the calendar and no notification is sent to those who RSVPed.
I have an app that would also automatically send a cancellation notice email separate from Meetup. This function would help streamline my planning process.
Thanks!