I'm.hoping to.exhibit at Doncaster again this year, I prefer it to its previous home at Harrogate.
There is a lot more space and the event seems better organised, the venue is very well laid out and staffed.
Cant comment about sandown but Donny is well worth a visit.
And there is a lot more locally than the peak District (which I love dearly).
Conisborough castle, Wentworth woodhouse (largest private house in the UK), Yorkshire sculpture park (free but pay for parking), National coal mining museum, Elsecar heritage centre and steam railway, Wortley top forge where railway axles were forged by water power (also has a model steam railway club on site) Kelham island industrial museum in Sheffield.
Just a few of my favourite places on mybdoorstep.