The boys went to a Renaissance Fair based in the 1500s in Season 2, the episode The Codpiece Topology.

The boys going to the fair.
The Fair[]
Sheldon kept complaining that it was full of historical inaccuracies.
Historical Inaccuracies: The tavern girl serving flagons of mead had a costume was obviously Germanic, but in 1487 the Bavarian purity laws severely limited the availability of mead.
- They would have had some sort of spiced wine.
- The flagons would not have been made of polypropylene.
- Bosoms would not have said "howdy" in the fifteenth century. They would have said “huzzah!”
- That was not fifteenth century soap.
- You can't just put “ye olde” in front of anything and expect to get away with it.
- Corn dogs didn't come into existence until the first half of the twentieth century.
- There are far too many historical anomalies.
Trivia[]
- Howard enjoys it because he gets to hit on girls and he gets to wear his Jester Costume his mother made.
- Sheldon called it a Medieval "Age of Enlightenment/The Any Excuse to Wear a Codpiece" Fair.
- What happens on Comic-Con stays on Comic-Con.
- Sheldon returned as a Star Trek science officer (though dressed as Spock) exploring a planet similar to Earth in the 1500s.