People do find the meetup via meetup website. Honestly, I spend a lot of time telling local people about it and following up with them every month until they finally come. That and putting it on blast on Nostr (Twitter before) and talking about it on podcasts. Shout outs/boosts on podcasts also works well. It's a long grind to find regulars. Just gave to keep reminding folks the meetup exists and eventually new people come.