A late call, but there are some wargaming displays planned at the Royal Logistics Corps Museum, Worthy Down, north of Winchester tomorrow, 24/01/2026.
I believe it's being put on by Wessex Wargamers Winchester, and may not have any ancient/medieval content, but may be of interest to gamers in the area.
Link to the Museum's page about it here:-
https://rlcmuseum.com/event/war-gaming-at-the-museum/