The Beelzebubs, Tufts University’s oldest male a cappella group, present their final show of the school year, “Bubs in the Pub,” featuring special guests Peking and the Mystics, an ensemble of Tufts grads that formed in 1973 and includes baritone Tim Vaill, a founding member of the Beelzebubs. Free admission and open to all; no tickets required.