I have absolutely no connection to CCC whatsoever and yet whenever I wanted to go to a CCC event (3 Camps and 2 Congresses so far, the first time in 2015), I could and when I wanted to take my partner with me, I could do that too. You just have to be fast to get the tickets before they're sold out, that's pretty much all there is to it.
Depends on when it was. Congress was less popular in the past so you could get a ticket.
Nowadays, most tickets go to hackerspaces and volunteers but the open sale sells out in seconds.
Camps are much easier to get to.
I did get my tickets volunteering for like a decade but last year I gave up - volunteering the whole event so I get a chance to go to the next event ... where I would volunteer the while event. That's not a good time.
Especially when there's more and more volunteers competing for work so they get a voucher - while the oldschoolers have no need for any of that because they can always get a ticket through backchannels.
Funny how CCC managed to recreate the worst aspects of capitalism as part of their leftist conference.