This is better known as the OPLSS, Oregon Programming Languages Summer School. It's amazing and the lectures each year are absolutely chock-full of gems. Anyone interested in PLs should listen to a few if not actually attend!
I attended the 2011 edition, and this was one of the best experiences I had during my PhD. Lots of brilliant people, amazing lectures, blue grass music, a rafting session, great beers and so much more. You have to go.