I'm just back from a fabulous afternoon at History Live at Kelmarsh Hall.
While we were there we watched a Roman training camp.
Had a lively debate about the Suffragettes.
Saw a very gory gladiatorial contest.
DD1 and I attended a lecture on Caesar Augustus.
DH, DD2 and DS watched a jousting competition followed by a reenactment of a battle from the Anglo-American war of 1812.
Then we all met up again just in time for a reenactment of the battle of Dunkirk with a fantastic Spitfire flying overhead. I got quite emotional watching it - thinking that the majority of the people involved in the real battle would have been around the same age as DD1.
The parade at the end was amazing - I have the utmost respect for the people involved in the reenactments. Some of the costumes looked very heavy and it was an extremely warm and humid afternoon. There must have been a thousand characters there. We all had a really brilliant day out. 
I think some MNers are involved in societies like the Sealed Knot. You do a fantastic job of keeping the past alive.