work on my 1972 plymouth valiant

You're about an hour away.
Most of the shows here are the third weekend of the month.
Google "Austin car shows" for the Motor Austin site for times and dates.
What specifically are you trying to do with the car? People here can walk you through just about anything if you're willing to learn and get your hands dirty. I don't know anybody local that works on other's classic cars that I would recommend.