Well... warm day... here in Netherlands, if the weather hits above 20 centigrade, it's all shorts and t-shirts!
With the weighting of the wooden swords, they do weight them to approximate a real sword. That means that thy are much thicker, or have additional weights. They are quite tiring to swing around!... and that's why they bruise like crazy!
Wearing those heavy costumes and using equipment on a par with the time period these people must have been exhausted by the end of the day.