Thankfully the event is now full, so it won't be bothered by people who struggle so much with how the concept of 'average' might be applied.
Those people mithering about 'concrete dust' can rest easy, too. I often find myself worrying about concrete dust when I'm driving down concrete motorways..... NOT.
Thankfully the entry list appears to be packed out with the sort of interesting car owned by careful relics older than me, so it's all good.