The above monthly event takes place this month on the Sunday 18th July at the open air market in Market Square.
Market Square is right in the town center either side of the market hall, and there's plenty of parking around within 5 minutes walk. 
Normally 40 dealers with plenty of soul 45 and albums for sale. Usually very busy with collectors travelling from across the UK. Last time there was Sean Hampsey and Kev Briscoe from Diggin Deep records with hundreds of soul 45's from 5 - 500 quid. Bradford's finest Derek Pearson, plus others with soul 45's and Lp's
Some video from the last event from AA Record Fairs Facebook site
https://www.facebook.com/aarecordfairs/videos/vb.103349294451460/175524164465406/?type=2&theater
https://www.facebook.com/aarecordfairs/videos/vb.103349294451460/778672736176802/?type=2&theater
Its run by AA Record Fairs if sellers want to get a sales pitch  - AA Record Fairs Andy 0758 7103047.
Future dates: https://www.chesterfield.co.uk/events/chesterfield-record-fair-chesterfield-market/
I have no personal involvement with this company or event I'm just putting it up for those who may be interested in attending or selling.

Event details