Stanford never got into this. Stanford's alumni association is mostly a front for the "development office", the alumni donation extraction operation.
Silicon Valley had the Capital Club in San Jose (closed). There's something called the Alexandria in San Carlos, which has a restaurant and a gym.[2] Cafe Borrone in Menlo Park is a hangout of sorts, and it's next to the British Bankers Club, which used to be a pub but upgraded to a fancy restaurant.
There's happy hour at the Sand Hill Sundeck, at 3000 Sand Hill Road.[3]
There's Hacker Dojo [4] But after two moves and COVID, it's a shadow of what it once was.
Those are places you go to make deals, or at least talk to people who do deals.
[2] https://www.invitedclubs.com/clubs/the-alexandria-san-carlos...