I'd have just packed away the cue sheet and done some exploring. The only group ride my wife and I ever tried to join started a bit like this but we lost them before leaving the parking lot. Ride was scheduled to leave at 8:30 and at 8:20, after we'd said hi to all and were getting our bikes ready, the pack left. We tried to catch them but never did. We took a great ride up the coast, explored areas we'd never ridden and thoroughly enjoyed ourselves.