Add support for posting events

[jamietanna]

I'm looking into starting a WordPress site that I'll be using to manage publishing of events, via Bridgy to Meetup.com when the support is added.

As I'm going to have a few not-as-technical folks using it, it'd be good to be able to use WordPress' editor if possible.

[dshanske]

I set it up to support events via Quill/Micropub but not yet the editor. Will see