Hiking / taking extend walks, boardgames, beach volleyball, gather at a ping pong table in a local park, volunteer work, walking a dog or dogsitting, movie & book clubs, language exchanges / classes, all sorts of courses at adult education centers, social dancing events, pub crawls, run clubs, poker nights, wine tasting, dining events, single meetups, pádel tournaments, ...

It is really not that hard coming up with something.