3 concerts in Marin this weekend
• An Ozzy Osbourne tribute night featuring Sabbath Lives, a local Black Sabbath tribute band, is at 9 p.m. Saturday at Mac’s at 19 Broadway in Fairfax. Admission is $12.51. Go to macsat19broadway.com.
• Alex Skolnick of influential Bay Area thrash metal band Testament performs with his jazz trio at 8 p.m. Sunday at the Sweetwater Music Hall at 19 Corte Madera Ave. in Mill Valley. Admission is $31.42. Go to sweetwatermusichall.org.
• Big Brother & the Holding Company, the long-running Bay Area band that once featured the late rock legend Janis Joplin, performs in honor of Joplin’s birthday at 5 p.m. Sunday at HopMonk Tavern at 224 Vintage Way in Novato. Admission is $48.18. Go to wl.seetickets.us/HopMonkNovato.