I've done something like this at different points in the past. I once had a group where every Wednesday night we would meet at the same pub for some drinks and dinner with an open invitation for anybody that wanted to join. Some weeks there were 3 or 4 of us, some weeks there were 20.
Had another group where every Saturday morning we would go to a different cafe for brunch. It was a smaller and less dynamic group, and we would organise the venue in a group chat throughout the week, but it wasn't a question of, "who wants to come this week?", it was just assumed we would all be there and phrased as, "Any objections to trying this place?"
Had another group where every Saturday morning we would go to a different cafe for brunch. It was a smaller and less dynamic group, and we would organise the venue in a group chat throughout the week, but it wasn't a question of, "who wants to come this week?", it was just assumed we would all be there and phrased as, "Any objections to trying this place?"
Mid-size city in Australia.