I'd disagree with this, and I consider my work 'fun'. In the Before Time, we had monthly summer grill-outs with families and Thanksgiving turkey bowling and winter pizza luncheons and other events. We had only one event (a Christmas party) at the founders' house after hours. But none of that was mandatory, try as you might one or two people are going to have a conflict for the Christmas party every year because the holidays are busy and that's fine.

But it's one thing to ask an employee to report after-hours for an emergency service call. It's another to demand they attend something (fun or not) that could have been during work hours but you scheduled it after hours.

When I first got a job after Uni, I moved to London where I knew no-one. By accident I ended up living in a house share owned by the HR lady that hired me and one of my housemates was another new dev in my team. There was plenty of money around for socializing and events planned so in the week, I had a great time going to bars, restaurants and parties at my employers expensive. Everyone loved it although it would have been nice if there were more women! They even hired the Albert Hall for a party one year. At weekends, I generally wasn't available as I would drive away to see old friends and go kayaking/climbing etc in the countryside. The weekday activities suited me perfectly.

Now if I joined a new company, I have family and young kids and plenty of friends that I want to spend time with. It's pretty unlikely whether I'd spend much time out of hours with the company as it would be far down my priorities and time would is limited. If I had nothing else on or it was something special, I might turn up.

My workplace is plenty fun. But so is my private life.

More importantly, people in my private life need my presence more than my company fun event needs it. Easy choice.

You sound like a stereotypical character from the movie The Office that would probably also tell people "They have the case of the Mondays".