Participating at Noisebridge can be quite simple: come and hack on something! This can be your own project, or someone else project, or Noisebridge itself.
If you'd like to hack on someone else's project, a good way to find out what people are hacking on at Noisebridge is to ask around, either in the space, in Slack, or the discuss mailing list. People will often post things on the discuss list requesting help, so keep an eye out!
You can also come to events being hosted at Noisebridge, or host one of your own! Our list of events can be found, and if you'd like to host one, we have a large lots of information on that here. Coming to an event is usually the best way to get introduced to Noisebridge, because a regular participant in the space will be able to guide you and tell you about how Noisebridge works.