My mother and grandparents have told me that in the old days, the 1930’s and 1940’s, in America, the Bronx, to be more specific, it was the custom to do community matchmaking on Yom Kippur.
All the young candidates would be at synagogue, in their best clothing and on their best behavior, and it would be up to the community to introduce those who in need of a match to each other.
Why not have more naturally mixed events, after holidays, etc., and have the community do its traditional job of making sure that every pot has a lid (my dear grandmother’s words) and every lid has a pot?