Please take this with a pinch of salt as I haven't been to either shows.
A bank Holiday wouldn't be an issue if it was in a major city. You would get lots of passing trade from Joe public, especially on a bank holiday as they will be looking for something to do after the school holidays. Daventry is more a place where you will go specially for Pinfest.
I think you just need to see the passing traffic that the Play expos receive.
By the sounds of it, you are struggling to decide what this event is. Is it for pinheads or is it a fun day out? For Joe public, they don't want to see pins they can't play. Especially new ones like tna and Iron maiden. So holding the main comp at night or at least for a set time would be better.
Thank you so much for this. It got me think about a few other things also and one the most important was the people that make UKPinfest happen. I'm a bit embarrassed about this whole thread now. I should have asked them first as they're the ones giving up their time to make it happen. People visiting are generally there for 3 days. The ones behind the scenes are there for 5 days and they're giving up their valuable family time.
And you're right to ask, what is UKPinfest? Yes, it is for pinheads. All are welcome but it is primarily for pinheads. We have retro events around the country which have pinball sections and they're a fab introduction for spreading the word.
We have the right balance of machines/attendees but I'll make the effort to get more machines. Also have the more desirable machines available for the whole event for the public.
Thanks @Horsey
It looks like it'll be Daventry on the bank holiday again.