My wife is very active in various Mom's groups. When we were living in San Francisco, she was invited to a 1 year birthday party. This was for all kids who we

My wife is very active in various Mom's groups. When we were living in San Francisco, she was invited to a 1 year birthday party. This was for all kids who were all having their 1 year anniversary (+/- 1 month). Met at golden gate park and there must have been at least 100 families there that day. After that there were various posts inviting folks to form smaller cliques / pods around different neighborhoods. We never got into it cause most of the ensuing invites were for weekdays and both of us work.