Still not sure what I think about this.
But I'd be interested in people's views on a couple of examples and their relevance or otherwise.
While I was a postgrad at Edinburgh I was a member of PAMS house - PAMS standing for "postgraduate and mature students". Undergraduates of the normal age (except, perhaps, as guests) were very much excluded because the whole point of the club was to mix in a way that did not include the majority. It was university-funded. No one seemed to mind. Same or different?
Also, ThePosie said something about a French playgroup near her and that she is "sure she would be welcome." I happen to run just such a toddler group and can categorically state that, in the case of the group I am involved in, you would be very much UNwelcome - unless you had a toddler who had French as a home language. Your nationality would not come into it - but your fulfilment of the stated criteria would matter immensely. Again, relevant or not?