Groundation will perform at 9 p.m. Friday, May 15, at Crystal Bay Casino Crown Room. Tickets: $18 in advance, $23 day of show. Guests must be 21 or older. Groundation is a root reggae band with jazz and dub influences from Sonoma County in Northern California. It is named for a Rastafarian ceremony. “Give us our justice and we will seek no more…” the band notes.