You want me to bring my car and charge me to show it. Well if my car and all the other cars didn’t show there would be no show. I think you need to rethink this. Might be just me but if there’s a cost to me other than my gas to get there I’ll be doing something else that day.
The one exception to this is charity events- if I'm comfortable with the charity that's being supported, and the cost isn't outrageous, I consider going.