On Friday night in the Bangor area, jam bands Roots Rhythm & Dub and the Midnight Riders play at the Bangor Arts Exchange, and the always-entertaining Popovich Comedy Pet Theater performs at the Collins Center for the Arts in Orono. It’s also the unofficial end to the Maine ski season this weekend, with the popular Reggae Fest set for Sugarloaf in Carrabassett Valley through Sunday. And if you’re looking ahead to warmer weather, the annual Old Town Canoe scratch-and-dent sale is set for Friday through Sunday at Ski Rack Sports in Bangor, where you can get a new or used canoe or kayak for a steep discount.