at sfjazz center, where i recently attended a couple of shows, they no longer check for vax status, nor are masks required
that said. masks are offered at every entrance for those that want them to wear during the performance
performers on stage do not mask (they never did, even earlier in the pandemic when audience vax status was being checked)... the venue is very large, recently built, has an excellent hvac system with presumably modern levels of air filtration