Is there a physical community notice board somewhere? Failing that, a local library? (The librarians would probably know where to find some sort of community notice board.) Those things often have group activities posted.

Unsure how common it is in smaller towns but in my city moat bars have event nights whether they're trivia, karaoke etc. Or, sounds weird but even going, sitting at the bar and watching a game has, in my experience, often led to conversation.