We are meeting once a month to share knowledge of and experience with Haskell.
Each time, one of us presents a topic, be it a library, a programming technique, development tools, or internals of GHC or other implementations. The format varies depending on the topic and the presenter between hands-on workshops, discussions and lectures.
Prior knowledge certainly helps, but we definitely don't require you to be an expert to join and/or to present a topic. The only thing that is important is that you are interested in Haskell and that you are eager to learn more.