You can contact the organizers via the following email adresses:

32C3-orga (at) cccv.de
for organisational issues
32C3-content (at) cccv.de
for conference program-related stuff
32C3-tickets (at) cccv.de
for questions concerning the ticket sale and tickets
presse (at) ccc.de
for press and pr issues
32C3-wiki (at) computerterrorismus.de
for technical questions concerning the wiki

There is also an IRC-Channel #32C3 at hackint (irc://irc.hackint.org/#32C3 or https://webirc.hackint.org/#32c3). You won't get any official information there, but you can get in contact with a lot people participating the congress. Most of them will be able to answer main questions as well, as there are quite a lot people involved in setting up and running the congress. Be one of us!

Regarding the wiki you will find the persons managing it in the #32C3-wiki irc channel on irc.hackint.org (https://webirc.hackint.org/#32c3-wiki).