I bought that book recently, as I want to become more of an organizer. I vaguely recall socializing with co-workers - like back in the '90s. I don't recall it

I bought that book recently, as I want to become more of an organizer. I vaguely recall socializing with co-workers - like back in the '90s. I don't recall it having been a great experience. You don't choose you co-workers. My good friends now fall into three groups: 1) old high school or college friends, 2) parents of daughter's friends friends, 3) gym-rat/marathon friends. The groups don't overlap. Still LOTS of parties - especially the fitness clan. The vast majority I don't go to, because I'd be out partying a couple times a week. I'm pretty introverted so I guess I'm just lucky to have strong friends circles. But you are correct that it takes intentional effort.