I can think of 2 events.
#1) Are you guys part of the Woodward Dream Cruise here in South East Michigan? Literally every type of car enthusiast comes to this event. The best thing is, people cruise this strip of road literally all summer long. The event is only 1 day in August, but yet it feels like the event is every Friday and Saturday throughout the summer, especially the week or 2 before the actual cruise day. People bring anything from the beginning of cars, such as Ford Model T's, to your big old Chevys, your Mustangs, GTO's, old trucks, new trucks, old muscle, new muscle. You name it, it's there.
#2) I think this may be a little out of the ordinary for you guys, but I see potential within. Each year there is a big snowmobile show at multiple Expo Centers throughout the North East. I think this just might work for you because there are a lot of people like me who like to keep their snowmobiles shinning just like their cars. We need polishes to make our aluminum tunnels shinning, waxes and cleaners to make the plastic panels on the front lookin good. I bet APC would be a hot seller, as well as any type of cleaner or detail spray. Don't forget, all of us have trucks that will be driven through the harshest weather conditions (snowmobilers are EXTREMELY dedicated, we have a very short season, and on top of that, we must have mother nature on our side). So no matter how much salt or snow or sand is on the road, we will driving north to our riding locations. This is another way you could sell waxes. You can find more information here http://www.snowmobileusa.com/shows.shtml#novi
Just a thought!