My advice would be not to try to cram so much into one weekend. Keep in mind that people's bodies and minds can only take so much, and then they shut down. Make it fun, let people get away from their sewing machines, even out of the retreat rooms, especially if there are things to see or quilt shops to visit nearby. Irish chain can be a very pretty quilt, but it's basically just squares and rectangles. I might introduce HST's too. And don't make it about finishing the quilt top. Some people might, some won't, but it shouldn't be a race. Just my 2 cents.