Oh IR , you will have a great time! I love Renn faires! We have one out my way (well a bit of a drive really but worth it!) where the actors are professionals and they basically go about all day IN character and garb.... and then there are shows by various people, food (not very medieval, but fun! LOL) and vendors with everything from hand carved wooden swords to jewelry and handmade glass. There are exhibits and artisans showing off their crafts... I love watching the blacksmiths and glass blowers do their thing and then there are the skits, period dances...Well, I could go on for a long time! LOL
Enjoy yourself!
