Some ideas:
-Check out meetup.com
-Arts & crafts classes at hobby stores like Michaels, JOANN
-Bookclubs @ your local library
-Grouponβs "Things to do" tab
-Register for a class(es) @ a community college or adult education center ie subject you're interested in, cooking classes etc
-Go to a sporting goods store and see what classes or excursions they offer
-Check your city's event calendar and hit up art walks, concerts, food truck festivals, etc
-Comic Cons if youβre into movies, anime and/or games
-Travel/tour groups
-Volunteer
