This past Thursday, Amherst kicked off the third annual LitFest with one of the more exciting events in the weekend lineup: the Poetry Slam. The midweek slump didn’t seem to discourage the audience, which filed in by the dozens. At 10 p.m., the Powerhouse, gutted and blue-lighted in preparation for the evening, was buzzing with chatter. However, the moment the host, Daniel Gallant — chief executive director of the Nuyorican Poets’ Café in Brooklyn — shuffled up to the mic, the room fell silent in a hush of anticipation.