MONTPELIER -- Vermont singer Grace Potter, who performed at Mass MoCA in 2010 with her band, Grace Potter and the Nocturnals, is going to be promoting fair trade coffee with a live, online concert. The concert at Joe's Pub in New York will be streamed live Tuesday on the Facebook page of Green Mountain Coffee Roasters. Potter is working with the Vermont-based Green Mountain Coffee as part of the "Great Coffee, Good Vibes, Pass it On" campaign. The campaign is a part of Fair Trade Month, which is designed to increase awareness for fair trade, a practice that gives farmers in the developing world fair prices for their products. The concert starts at 9 p.m. Tuesday.