For anyone who may be interested, Allegheny College in Meadville, PA hosts a band camp for adult musicians every year in June. Conductors are Col. Timothy Foley (retired director of the US Marine Band) and Capt. Michelle Rakers (current assistant director of the US Marine Band). Other instructors include professional musicians and college professors who teach master classes and lead small ensembles (including a saxophone ensemble, clarinet ensemble, jazz band, dixieland band, and many more). More info can be found here: http://sites.allegheny.edu/conference/band-camp-for-adult-musicians/, and I would be happy to answer any additional questions.