car club
I'm not aware of any Mopar-only clubs locally. You might want to try contacting a local shop that specializes in restoring Mopars like
Classic Car Restorations.
You might also want to consider joining a more general car club (like
ACCCC) as they usually have lots of members with Mopars and have activities year-round.
Rainbow Region, for example, has an annual
Christmas party coming up on December 1 at the
Niagara Parks Whirlpool Golf Club that you're welcome to attend.