Make events user creatable.

Wording and imagery is subject to change (obviously).

Just wanted to get this reviewed so that when the wording's decided it's easy to pull the trigger.

:eyeglasses: @umbrae @Deimos 
I think it's fine either way, I actually had to look up the 3-argument one the other day to verify which one it would use twice, since it's pretty rare and I tend to forget exactly how it works.