Free: Contests & Raffles.
You're missing the best rafting on the Wenatchee by a few months.
when you say rafting do you mean just floating it? I would talk to a guide and go with them as they will have all gear, transportation etc. Lots of places to camp along the Columbia like Lincoln Rock, Daroga, Beebe etc and they are all within 30-45 minutes of Cashmere. You could also go the other way and camp up by Lake Wenatchee.
This post brings back a lot of fond memories. Back in the early 80's while going to Jr. College in Wenatchee we would go down to Sleepy Hollow bridge with fishing nets and net cans of beer that were floating down to the Columbia river. These all came from the rafters up steam who tipped their rafts over with ice chests in them. On a good day one could get well over a half rack.