On kumos, clicking the "View all →" link on the events widget or the "View All Events" button on the events tab both send you to https://kumos.subeta.net/user/events, which doesn't seem to exist (or at least doesn't work).

(Found while trying to mass-delete kumos events. I have more than three hundred over here and they aren't ever going away if I have to delete them one at a time XD)

There was never any response (I didn't even see a mention in the "Big Kumos Changelog"), but the page seems to have been quietly fixed and is working again.