Bars are notable for staying open late, but I’m not really familiar with alternatives that might operate similarly. I think many cafés (at least around my area) tend to close a few hours earlier by comparison, which would be my go-to for an alternative otherwise, so what other options are there?
Even if they do go late, I don’t really view it as a substitute for a bar. It’s people who know each other meeting at a home, rather than a place someone can simply go.
Some book clubs are open for everyone.