For writers, not authors. Authors get paid, writers just love writing (but would not be adverse to becoming authors).
Spend time on writing exercises (pick three words from a pack and write, without lifting pen/pencil, for 3/5 minutes, etc.).
Read for the group, with or without comments, as you desire. Get feedback on a work in progress. Share info on recent good reads. Also, perhaps, joining in a "No Plot, No Problem" project. (Google that if you're not aware of what it entails.)
Basically, anything to feed your love of the written word.
Coffee, tea and soft drinks provided. Champagne when someone gets published. Participants to take turns bringing snacks.
Duration: two, two and a half or three hours, as group decides.
Group size: no more than 10 given space constraints.