SAN FRANCISCO—In an announcement that met with sarcastic cheers, Nate Pilson, lead singer of opening act Dickbasket, issued a two-more-songs warning to a crowd waiting to see headline act The Colecovisions. "This next one's gonna be our next-to-last song," said Pilson, 25, prompting widespread stretching and watch-checking among the Bimbo's 365 Club crowd. "It's from our upcoming EP. Hope you like it." Pilson then energetically launched into the song, trying not to notice the throngs of concertgoers streaming toward the bar or resuming the conversations they were having before the warning.