I have been to a couple of the smaller ones as just a walk-thru visitor, but many decades ago I used to go to a local park once a month where they held SCA events such as mock jousting, mock swordfights, etc, plus feasts, celtic music, dances, etc.
It was fun to just observe all the fun and frivolity.
I knew a guy who made his own chain mail suit by hand, one small ring of metal at a time, using thousands of 1 inch pieces cut from metal clothes hangers, then bent into loops and hooked or 'stitched' together, one by one.
Lots of the guys were wearing simulated, home-made armor, carrying huge (but not real) broadswords, medieval morningstars (spiked metal fighting balls) and various DIY simulated weaponry.
The gal I was usually hanging out with (not a G/F, just friends) was quite the 'fair maiden'...visually enchanting in her own chosen style of very colorful and flattering attire.
Of course, I moved on and in different directions but it was fun for a short time.
Turns out, SCA is still a 'thing' after all these decades:
https://www.sca.org/
Who knew?