What interests me is why humans crave this one time in history (medieval?). It’s old enough to be different than now but not old enough to be like caveman times? Lower technology than now but not no technology. Do people in other countries that aren’t western civilization have similar cravings for that era or an era like it?
It is especially interesting the way people tend to portray it drained of all religious overtones and entirely secular in nature, so that it is palatable to all comers, whether pagan, Christian or Jew.
TFA completely fails to mention the utter fandom that has grown alongside RenFaires: The Society for Creative Anachronism (SCA). People who are involved with the SCA basically have ongoing year-round RenFaires of various magnitudes. They develop entire in-world personas for themselves and they're assigned to Kingdoms and such, regionally. I'm not sure of the relationship between the two, but it's certainly symbiotic and RenFaires give a taste of what people can have, 24/7 in the SCA.
Medieval life is also attractive to traditionalists of a Christian nature, again -- before everything was "ruined" by science and modernism. We all love going back to the 16th century to see how it all went wrong, or the 11th century to see how it also went wrong!
What's more, plenty of other subcultures draw on medieval tropes, such as goths and filkers and whatever con-going fandom is up to these days. Any competent cosplayer can "seamlessly" meld into a medieval princess or wench just by designing the right costumes, and there are plenty of YouTubers and Etsy sellers ready to assist!