Imo the big problem with Christmas fairs is that they have to be held indoors. In our school it ends up horribly noisy and crowded and you can't browse the craft stalls at all (yet the second hand tat gets a whole classroom so the kids can spend ages browsing and buying rubbish)
So no.1 for me is space.
I'll happily pay for tea (it's usually included in admission) but would like somewhere to sit and chat.
I'd quite like mulled wine and if it's a local event lots of people are probably walking so it's not a driving issue
I love the old favourites like guess the weight of the cake, or how many sweets are in the jar....but if the room is crowded I won't stop.
I love craft stalls and this is one thing that you can probably put outside as many craft fairs this time of year are outdoors. Lots of people have gazebos etc waiting in their gardens for summer, so can't be too hard to organise
I hate Santa's grotto. I really don't want the pressure to visit a lacklustre obviously fake Santa.
Happy to indulge kids with face paints but need lots of volunteers so the queue isn't an hour long
If you have to sell second hand uniforms sort them by size
Put musicians outside where they can be heard and enjoyed not inside competing with the conversations
A snow machine (outside) would be fun.
Knock the tin cans down/ hook a duck type stalls for small money and certain prizes are brilliant attractions for kids
Please no bouncy castles
(Sorry this is more rant than helpful)