It’s always Halloween at a Gwar show. (See left.) Check them out tonight (Thursday) at Upstate Concert Hall (7:30 PM, $20, 371-0012). . . . From Steve Earle’s band, Allison Moorer will play Club Helsinki on Friday with David Jacob-Strain (9 PM, $30, 828-4800). . . . The Adam Ezra Group will play the Hollow Bar on Friday for free (426-8550). . . . Black Mountain Symphony play Putnam Den on Friday (10 PM, $8, 584-8066). . . . Albany’s Oobleck open for New York Funk Exchange at Red Square on Friday (8 PM, 465-0444). . . . The legendary Mavis Staples will play the Bearsville Theater on Friday with Ryan Montbleau (8 PM, $39-$75, 845-679-4406). . . . Charmboy shares a bill with Skunk Hostage and Hill Haints Saturday at Valentine’s (8 PM, 432-6572). . . . Grammy winner Chris Botti plays Proctors on Saturday (8 PM, $20-$75, 346-6204).