Maybe it's different in SanFran/SV, and likely very different in trendy start-ups, but in my ~15 years of working in the private sector in big, medium-sized, an

Maybe it's different in SanFran/SV, and likely very different in trendy start-ups, but in my ~15 years of working in the private sector in big, medium-sized, and small companies, I never once was even invited to a happy hour after work. One company (Intel) did have a bunch of "team-building exercises" where we'd go play laser tag, or go to lunch together when a coworker was leaving the team, but that's it, and all those things were held during work hours (and considered work time), and paid for by the company. There were complaints in some departments and groups about having to work extra hours in order to compete with other employees in the year-end ranking/rating, but I never saw anyone expected to put in unpaid time after work for merely socializing. I also never saw it in a bunch of other companies I worked in. If this is something that happens at all in the US, I'd expect it with Silicon Valley start-ups, but I don't know because I've never worked at one of those.