As of right now, my show is still on tonight (Grease at Olney Theatre, Olney, MD), though I've heard through friends most of the shows in the DC area have been cancelling. House count stands at 129 (and dropping; it was at 217 after the matinee). The theatre is providing housing for anyone in the cast/crew who does not want to drive home after the show.
Cast and crew are prepped on emergency procedures in the event of a power outage and we have tons of flashlights, my ASM has a walkie-talkie backstage, and I've gone over emergency procedures with HM staff. Hoping all goes well.