In my case as a large city dweller, I often use events at the library where many talks of my interest are offered -- with a chance to mill about with others, tho I (like others) find many come with their own bunch while there are others just to socialise around games (checkers, scrabble etc) and some specialised ones like Death Cafe. I go wherever there is a decent chance to initiate some conversation.

So Monday I'll be attending retired people in lifelong leaning on Democracy with material to cover over over 14 presentations by Participants over 3 months. I've signed up for a three more like Physics, News of the 2-weeks etc.

Also there are a few Meetup.com run events that are publically available often free like Skeptics, walks, Humanists, Philosophy. The choice is vast, many have offering in large US cities.

I type in the browser to find what's available with search terms that suit me: other day I wanted to see if I could offer free /volunteer tutoring to new comers.

In the past there's been meetup for people with cats, as I have one. Or walking in snow in local parks, or even started my own to meet over coffee to talk about topics of stress management/ healthful eating etc.

My reason to participate is less to do with Learning and More to do with striking a friendship. So if that opportunity is minimal, I have no use -- after all one can learn on their own in one's den over the screen! BUT leaning attitude is also an indication of being open to new experiences=Curiosity. The most human trait that defines us -- and we pay dearly (in diseases and early disability both mental or physical) when we let it starve.

Hope you find what is Enjoyable and gives a sense of accomplishing what's worthwhile in your life! Good luck!