Hiya all...need some advive from some DD vetrans

I have never been to DD before and am taking my pup on saturday to be part of the GCDS puppy demonstration.
I have just been given the programme and see that we have to do it twice....meaning we will be there for most of the day (a long day for a young pup)
I have been told that we will have our own 'bench' and im thinking i should take him a crate so he can rest up. I cant take his home metal crate as we are going by tube and it's way to heavy to manage as well as a dog

so my question is.....if i get there early do you think i will be able to buy a soft, folding travel crate at the event and is it likely to be a bargin or more expensive? or do you think i should run round and try and find one today?

Im hoping i can get one there, but obviously dont want to get there and find i cant.

Also any advice on what i should take for a whole day out with pup (other than food obviously lol) would be gratefully recieved as i have never had a dog or been to a dog event before

(im excited but starting to panic!! lol)