I like some of the smaller events a couple of analyst firms put on. I like the Linux Foundation's Member Summit; that's invite only but I've spoken there a number of times. Also their Open Source Summit. Kubecon has gotten pretty big but I will actually be going to the one in London because I'll be over there anyway. When I was at Red Hat, I usually went to their Summit which I liked--in part because I knew so many people there. Devconf.cz. Also have been to Devconf.us but Red Hat may be rationalizing some of the pure open source US events they're the primary sponsor of.

I have liked FOSDEM in the past. But, as I say, it's gotten pretty big and crowded and some other events in Europe that have been timed to coincide with it aren't of as much interest to me these days.