I try and edit some events and I type /events and I just get NULL back in the chat.

Update: I did /quests events and that produces the Events Editor. This should be clearer on your Wiki page as a command I think, just letting you know!

It looks like Blackvein removed this command at some point but did not update his wiki (which I used as a reference). I have updated the plugin.yml and will update the wiki upon the next minor release. Thanks!