I moved them out of the main header in this diff (putting them closer to the invite list) since they felt kind of weird to me up there, but I can put them back. I'm not really sure we need them.

Is this an event you've been invited to? Or just an event you happen to see? I expect if I'm invited, the actions are more prominent. If it it's just some random event, then maybe just a join button? I haven't played with these much yet.

The big action buttons only show up if you have an unresponded invite.

There are normal ways to interact with invite status in the standard action list (e.g., "Decline Event") to an event you previously marked yourself attending.

Yeah sorry, I slightly prefer them in the header now that I've had some caffeine. :(

Haha, no problem. I expect a lot of Calendar stuff to need a few more UI iterations, I'm just trying to move things somewhere in the right direction and get the backend kind of reasonably well organized for now.

The buttons feel weird in this diff to me too, just also weird in the other spot. ¯\_(ツ)_/¯