For a first time show, don't think you would want to limit the entries to pre-anything!!! There's so dang many shows now and it's hard enough to draw decent cars. To get a decent turnout it might be better not to turn away anyone that shows up! The show is for the public, not for the owners of the car's on display! Once a show has been on the schedule for a few years and shows a trend towards a certain type or era of cars maybe then you could start limiting entries? Seening as how it's a fund raiser, why turn down anyone's money????