Seattle’s local clarinet festival Clarinetissimo happens in October each year.  Check the website for more information and to sign up for masterclasses.

http://www.clarinettissimo.org/

Here is a list of websites for summer camps in the area.  This list is not all-inclusive, but can give you options over the summer.

http://www.cornish.edu/summer/courses/chamber_music/

http://www.byso.org/summer

http://syso.org/mitc/m_index.html

Ihttp://www.evstern.com

https://www.seattlejazzed.org/ambassadors.html

http://www.jazznightschool.org/jazz_school_about_us.html