Jonathan,
Are you anywhere near Chester this bank holiday weekend?
As its the Big Roman Fort Build at Past in the Park. Near the Village of Hope.
They're building the East gate of a turf fort (in fact they've planning permission for the whole fort,and more) The museum isn't technically open(on account of it being built.) But the site its self is open and the public are welcome.
The build is being undertake by dozens of re enactments groups. All have been asked to come in kit and put on displays,as well as build the turf fort in their re enactment costumes.
A lot of my friends are there unfortunately I'm not as the Mrs is ill.
Mark.