I belonged to the group Toastmasters a few years ago (its a public speaking group).
Wow, the hot professional women you could meet. Met a gorgeous brazilian woman, 30-35, gorgeous persian/iranian woman, like 36-38. But like full DD's, haha. And some other young little hotties.
Depends on the group, but some throw halloween parties, christmas parties. I got invited to a birthday party (by the brazilian). Didnt get to go, but she invited, I dont know, 50 or 100 people. Brazilians are known for being fun party people. I thought it was interesting, since it wasnt even a social group. But interesting way to meet some smart, motivated, and hot women. Like MBA's and stuff.
Also, theres several regional speaking contests through the year. You can go fairly deep in the organization. Attracts high quality people IMO.
My social skills werent what they are now, and my confidence/inner game was not good. I didnt really game any of the women. But a good experience meeting some qualty older women you wouldnt ordinarily meet.