You can just show up and shoot on Saturdays. The formal guest thing is only for the other ranges. Trap is open to the public on Saturdays from 9 until the shut down- normally around 1 or 2 once everyone is done shooting. The trap clubhouse is immediately on the right as you come down the drive- just head in and sign in and sign up for a squad. Mike and Ed normally run things- one of them will be there to get you sorted.