I'm pretty sure we never have, so I'll assume the answer's a collective no. Which means this coming Saturday (July 22) is your lucky day, for CST will be playing a concert at Camp EWALU and lo, verily there is a Christmas tree set up on the stage whereupon we also will be. Hopefully there'll still be room for Jesse...
We played at EWALU last year, too, and it was a really fun show; good-sized crowd that seemed to enjoy our stuff and were eager to participate in the participate-y bits; camp staffs (staves?) are just fun people, in general. It's a free show at 7:30 in Cedar Lodge - here's a fairly unhelpful map showing where EWALU itself is. Hope you can make and that you're having a lovely summer and whatnot.