Another consideration is that wetplate is very sensitive to heat and doing an earlier workshop may minimize problems associated with hot weather. Although on the flip side, if anyone should know remedies for heat problems I would think John Coffer would have the experience. I'm doing the earliest workshop because it allows the remainder of the summer to practice wetplate (and it is a good excuse to take a few extra days of work off before the holiday). Coffer also holds something called a "Tintype Jamboree" for alumni at the end of July so I'm hoping to make that as well.
I'll be camping too. Maybe we will get a chance to meet.