OK, but how do you equalise things to be fair? For example, how do you equate a time from a lightweight, drag-slicked car vs a stocker?
This is why I suggest just a PB sort of day, because unless everyone agrees to run in the same spec, then you're comparing apples with oranges.
To me, the only other fair way to do it is make everyone do a "daily driver" run, with all bits attached and normal road tyres and base the comp on those times. Then those who want to run with slicks, stripped, etc, can run for their PB's.
I realise that the weight and slicks don't quite make the same difference as, say, FI over NA, but they still offer an advantage that not everyone can have for whatever reason.
Andrew obviously drags his car as a regular hobby, and all the best to him, but for most of the Corolla guys (and I'd imagine a fair proportion of the Mazda crew) who only drag maybe once or twice in their lifetime, the time and expense of removing everything and having a set of drag tyres set aside is not practical, or relevant.
Mind you, if the Mazda guys are using Type-R stickers, then most of the Toyota's have an advantage ... everyone knows a TRD sticker adds far more HP than the Type-R ones!