The tentative dates for the first two work weekends will be April 2 and April 9, so you can PENCIL these in.
Work weekends consist of general site maintenance and cleanup, organization and cleaning of props and costumes, construction and installation of new features for the camp, painting, etc. They're generally hard work but a lot of fun.
You also get a very generous goblin stamp reward for coming out that includes your mileage for driving out and back and a magic item pick if you put in a full day's work, ie, 8 good hours. Be aware, that if you come out and just kind of goof around for a full day, you will not get a magic item pick or as many goblin stamps. I have final say on this.
Scott