Can't delete recurrence

[osteele]

• Visit http://events.olin.build/
• Click on the “Talk about recurrences” recurrence
• Click “Edit”
• Click “Delete”
• “Are you sure you want to delete this event?” → “Okay”
• The view switches back to the month view; the recurrence is still shown

It's possible this is fixed in dev. Because of #120, I can't test it there.

I'm marking this Blocking because until this a fix is deployed to production, we can't (use the GUI to) prepare the production calendar for public use.

[kylecombes]

There are several potential causes for this:

1. event deletions may not currently be reflected immediately on the frontend (until a refresh/requery is triggered)
2. the event may not actually be deleted due to the recurring event ID structure being different than non-recurring events
3. something else

I can look into it more later.

[kylecombes]

This is blocked by olin-build/ABE#191.

[kylecombes]

This is no longer blocked, given the knowledge that the format YYYY-MM-DD works for getting recurring event instance data.