So what are those awards exactly? And are there going to be multiple different categories (such as standard, premium, performance, concept, etc.) for whatever cars are submitted? Whatever you do, donāt forget to make a sound ruleset regarding such aspects as techpool, price, road legality (in terms of emissions, safety, etc.), among others.
There is no ruleset, there is no winner. It is not a challenge. Car shows have previously been held in car design sharing forum and I donāt see the benefit of changing that now.
For context, here are some other car shows held on the forums.