In all manner of ways.
Most do via hobby, sports and social clubs; voluntary organisations including churches, charities and museums etc., and/or local public events like lectures and music recitals.
Many such also do use the Internet but constructively, to learn of such organisations and events, and discuss shared interests.
I belong to various societies that all use their own web-sites and e-post round-robins to keep members in touch, announce events and facilitate formal and informal meetings. Plus I use general fora dedicated to their interests more publicly.
While some of the public events I attend - lectures and occasional performances - are advertised in my local newspaper. (Though sadly, after the 'Newsquest' group who publish it was taken over by some American outfit appropriately called 'Gannet', its value for local news and events has dropped significantly.)
Am I somehow unique or unusual in this? No!