In my experience, Lancaster PA is the largest on the East Coast (if you consider 3hrs from the ocean "coast"
NJ is dinky but has an intersting storyline acted out throughout the day.
MD, I love because @ the end of the day, while people are exiting, the pirates & gypsies all gather around & play bongos, drums, etc. There's few things as powerful as 20+ skins of different sizes playing african rythms @ the same time. After about 20 mins of this, the festivals piper walks up & plays the 3rd part of clumsy lover over & over to the african rythms.
I like VAs because of the way the forest has naturally set an incredible scene. I forget what the trees were, but the roots were partially above ground.
There are a couple in FL that have some awesome jousting & fights.
The same steel on steel company that fights in Jersey also fights in Boston. All they do for a profession is fight w/ weapons, so they look the most realistic of any I have seen. Their choreographer rocks. You can't tell when they pull strikes. or slow swings.
I haven't been to the one in Salzbury, MA, but I want to check it out. It's only 1 weekend, so I don't expect much. However, it is outside the only museum in the US dedicated to arms & armor. There are several art museums that have armor, but the Higgins armory is nothing but 3 stories of arms & armor.
The best time to go to Renn Faires is on days that it rains in the morning. Most people don't want to go sightseeing outside on rain days. Therefore, they stay home or do something indoors (movie, museum, etc) I went to one renn faire where it rained from 7am to 10am. The sun came out, I went, & I spent the entire day @ a renn faire where there were only about 30 tourists there. It had a very surreal feel being almost the only one not in costume.