Hi and welcome to the Weissbierbude
You don't have to register or sign up for any event. If you will need to it will be written right below the picture on the frontpage.
The only server with a password is the teamspeak-server, and yes, for that you will need a headset (or at least a microphone)
It's a voice-communication program like skype, just not as bandwith-intensive as skype is. We will set up one server for people using teamspeak every event, and a few others (depending on how much people take part) where you don't need a password or teamspeak. We decide spontanous how many "free servers" we start. If the non-ts server is full after a few minutes we start a second one, and so on...
And don't care too much about the language-section in which you write... Most of us understand both languages
Best whishes,
Marian
PS: The "common" language in TS is german. The most people in there are german (during the events). But don't be afraid, we can talk english aswell