For Houston music fans of a certain vintage, just the name Sammie is sufficient to conjure memories of sweaty Saturday nights dancing to a nearly bottomless well of classic soul oldies, shows that often ended with the entire audience shaking their collective groove thang. That was the scene at the old Gallant Knight for years and years, and then 2016 Main after that; the music ceased at those long-gone venues, but Sammie Relford hasn’t. Since leaving 2016 nearly a decade ago, the dynamic singer has struggled to find another regular home, but he’s never quit trying, and anyone familiar with his never-say-die spirit knew it was just a matter of time before Sammie got another shot. On Mother’s Day, it comes at the Preston Theater, the brand-new venue near Minute Maid Park which recently hosted Bun B and other top Houston rappers for an episode of the hit Web-concert series Boiler Room. This early-evening show (6 p.m. doors) will be filmed for the debut installment of Preston Theater Live, a similarly minded showcase, and all the mothers in the house even get a free Sammie CD. Early-bird tickets, available here, start at $10.