News on this event has been very low-key this year, but it is going ahead. It doesn't look like Jill Mill at Clayton will be activated, but Chailey Heritage Mill (also known as Beard's Mill) with special event station callsign GB0CHW will be.
It seems that Gavin Keegan G6DGK has registered the mill for the Downland Radio Group and Gavin and other DRG club members will be operating from their home QTH's, as special restrictions obviously apply with regards to Covid-19 and the mill itself is still closed to the public.
GB0CHW is nominally located at locator square IO90XX, WAB TQ32, OS Grid TQ 387 214, Postcode BN8 4DJ.
If you'd like to go and walk around the mill (outside the grounds) this weekend, it's located in North Chailey on 'Red House Common'. It's a beautiful location, particularly if the weather is good - which it was when I visited a couple of weeks ago and took these photos. You can park for free in the car park just off Warrs Hill Lane.
More information on the mill can be found here: https://www.chailey.org/amenities/chailey-windmill-museum
GB0CHW has its own QRZ page here: https://www.qrz.com/db/gb0chw
Denby Dale ARS have organised and managed the amateur radio side of The Society for the Protection of Ancient Buildings (SPAB) National Mills Weekend (now known to us as 'Mills on the Air') for all of the 25 years it has been running - huge credit and thanks to them.
You can find details of all the other registered participants on their website here: https://www.ddars.net/registrations.html
This year is the 25th anniversary of Mills on the Air, so be sure to call in if you can.
Good luck to all stations (this is just for fun - it's not a contest) and I hope the weather is better in actuality than it is in the forecast!