@User your best path is to either
1. organise your own local -or- virtual meetup build that , then look at what you can expand.. if you build it they may come
also i knew you meant across the board, i am obviously doing my tin hat reply based on my meetup experience.. obviously i cant and wouldn't comment on the UmbBristol or any others because again the idea is theses are meetups for a local audience and have a local identity what we do in London is not necessarily the approach others should take.. we have only gotten to this after nearly ten years.. ( i took over in 2012/2013)..