www.bso.org/brands/bso/contact-us/jobs/tanglewood-seasonal-jobs.aspx
www.hireculture.org (actual listings)
www.berkshirecreative.org (actual listings & ideas for other organizations to pursue)
www.clarkart.edu (museums generally, education, kids activities, special programs)
Also check;
Indeed, Simply Hired, Monster, Craigs List etc. for listings as wellas local newspapers and everyone you know.
If there is a related listing, but not exactly, figure out a way to approach the hiring organization. See the career counselor for advice.