The only ones I see are Disco Warzone, Disco Latinoamerica and Disco Sirius. I have tried restarting both the launchpad, the game and my computer, and waiting for about 10 minutes. The official server is still not on my list, while I have an event appointed for 15 minutes ago.
What should I do?
Never mind. Solved. I connected to one of the servers I was able to see and then I returned to the server list. I'll leave the post here though, in case it happens to other people too, which would mean it's a bug that needs fixing.
Updates are automatic, so yes, I had done it before. It doesn't happen any more, though. Not that I remember. It doesn't seem to be related with my launcher version, but looks quite random, I don't know why.