At a hack night we will be working on a project of ours. We usually maintain a collection of projects and chose one or several to work on during a hack night.
At the beginning, participants announce what they would like to work on. Depending on the interests, we either work in one big group or several small groups. If we've worked in small groups, at the end of the meetup we will shortly present our results.
If you are a beginner that wants to learn Elm, you might be interested in one of our upcoming Beginner's nights.