Yes, I hadn't thought of it like that. Travelling is also a time when it's considered normal to be alone and to chat to new people, reinvent yourself if you really want to. For many, that only happens a couple of times in their lives, if at all. (And again, that's why people stay local and don't move countries, because they don't want to do that).

Meetup.com is the closest I've got to what you describe, but not quite the same. It's a pity, I agree.