Meetup was made in 2002, never heard of it until now. Not sure how active it is but guess I'll create a site..."Let's go Shooting" sounds inviting and innocent enough. Fees aren't too bad, ask for donations when there's an event. I'll structure it so I have a few knowledgeable volunteers, and provide people a path from not knowing anything, have some free or low cost shoots with 22lr, give them info on training classes, practices, and get into competitions with various clubs.
I'll also look into using eventbrite to list events.