If you like seeing people in period costume then English Heritage do an event that you would love.
It is called Festival of History and this year it is on 25th and 26th July.
They bring together all the historical recreation groups for the weekend and there can be about 6,000 people all in period costume.
It covers people from "cave men" through Roman, English civil war, US civil war, Napolean, WW1 and WW2 and everything in between.
They divide the huge fields into "camps" where people live as they did in that period of history. You can go round the camps and see how people lived, slept, cooked.
There are lectures, fashion shows, book readings, and all sorts of things from history.
They also do mock battles from different periods from history, often featuring up to 500 people, and in the past WW1 and WW2 battles have featured tanks, spitfires, lancaster bombers etc.
There is so much to see you need both days and you still wont see it all.
Here is the English Heritage site that mentions it, just play the video to get a small idea of what it is like
http://www.english-heritage.org.uk/server/show /nav.20303