Possibly unpopular here but how about a Discord server with a channel for every city? When you join Discord, a bot could ask which cities you want to join (allo

Possibly unpopular here but how about a Discord server with a channel for every city? When you join Discord, a bot could ask which cities you want to join (allowing people who travel to join multiple cities, but maybe limit it to some sane number to prevent bots from trawling everything).