The Tucson Arizona Mass Choir, an interfaith gospel group, leads a gospel workshop from 4 to 8 p.m., Friday, Nov. 20; and 9 a.m. to 6 p.m., Saturday, Nov. 21. $60 for both days. The choir performs a concert from 4 to 6 p.m., Sunday, Nov. 22. Free. Call 743-0279 or 903-2499, or visit masschoir.home.att.net for more information.