Poor Man’s Whiskey may have up their collective sleeve for their New Year’s Eve show, and that’s a large part of the appeal. This is a bluegrass band who in the past has covered both “Bohemian Rhapsody” and Dark Side of the Moon; their unpredictable costumes lend a theatrical air to the surprises. Party hard on Saturday, Dec. 31, at Hopmonk Tavern. 230 Petaluma Ave., Sebastopol. 8:30pm. $30. 707.829.7300.