Rose Theatre (385 Taylor St., 360/385-1089, www.rosetheatre.com [1]) is a refurbished and reinvigorated old-time movie house, now showing concerts, plays, and the occasional art-house movie.
The Key City Public Theatre puts on plays and musicals throughout the year at the Key City Playhouse (419 Washington St., 360/385-7396, www.keycitypublictheatre.org [2]).
The Port Townsend Community Orchestra (360/732-6898, www.porttownsendorchestra.org [3]) gives four free performances between October and May.
Links:
[1] http://www.rosetheatre.com
[2] http://www.keycitypublictheatre.org
[3] http://www.porttownsendorchestra.org