Sorry you had such a bad time. I've never had a desire to do that ride because it seems rather a bad idea in bad weather. I agree that they probably should have cancelled the ride. By the same token, however, anybody who chose to participate in the ride arguably should have anticipated some spotty conditions, especially on neighborhood streets.
In any event, if you're really bothered by what happened, send an email to the ride leader and/or to the leader of CIBA's ride committee. They should be open to criticism and comment, so let them know you felt that the ride was badly organized and, at times, unsafe. To the extent it was labeled as a "Grand Touring" ride, the ride leader should have tried to keep everybody together.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher