At least here in Spain we do have medieval markets not tied to a specific festivity.
Not sure how much they resemble American ren fairs, but they tend to have falconry exhibitions, smiths forging stuff, sellers of wooden toys and artisan jewelry..
At a surface level, that sounds very similar. There’s also a lot of selling of art, swords, axes, period clothing, and such. Oh, and it’s the US so there’s lots and lots of food.
Not sure how much they resemble American ren fairs, but they tend to have falconry exhibitions, smiths forging stuff, sellers of wooden toys and artisan jewelry..