This was a late notice from a reader
18th Annual Youth Chamber Music Camp Five days of inspired chamber music rehearsals and classes for music students—with outstanding Northwest coaches August 15-19, 2017
Although it says "auditions "are over, it's absolutely possible for a child to sign up, simply a matter of sending along a quickie tape or video clip to ask the student to comparable players.
This is an outstanding Summer Camp for instrumental orchestra, the really neat thing is that it's chamber, so individual efforts really shine brightly.
Plus, the legendary Marcus Tsutakawa is faculty, he of Garfield fame! "