Supposedly expensive cultural institutions (art museums, symphony, ballet) play this role because they have events for their major donors to hang out with each

Supposedly expensive cultural institutions (art museums, symphony, ballet) play this role because they have events for their major donors to hang out with each other, as well as tastefully publicizing who their major donors are. If you donate enough money to a cultural institution, you can get your name mentioned somewhere and also get a couple of high-end party invitations. (Maybe not during COVID?) Maybe you should get some kind of style consultation / makeover before attempting that so people there don't think you look that weird? More concretely, we might ask what your goals are in meeting other very rich people. There isn't just one kind of rich person and there isn't just one social circle of rich people. You could also take up hobbies that you find you genuinely enjoy; if they're expensive hobbies, maybe you'll find that some other people involved in them are also pretty well off. Also, if you start donating to charities, you could have some frank conversations with the donor relations people about your interests -- at the high end they probably have some individual relationship with, or at least some substantive knowledge of, their other major donors. So you could ask the people receiving your donations about your interests, whether framed socially or in terms of wanting to develop your philanthropy by talking to like-minded donors.