This weekend - May Day Bank Holiday sees the English Civil War Society recreating the final siege of Newark. It looks like a worthwhile event and by the look of it it's free. Check the above link for details. Sue and I used to be members of the ECWS - it's a great society with lots of talented people who can really bring the period to life. Well worth a trip out.
The Sealed Knot - the 'other' Civil war group are in the South-West at Berkeley Castle.
In the south-east the Hop Farm hosts a Wild West event that promises to be fun - with all manner of Cowboys and Indians and American Civil war action.