People have gotten interrupted by Boudewijn, but he seems to be appear more rarely this year. I have yet to get him myself either.

I've checked all my dances, and still he hasn't visited me either. I thought he was bugged this year, but maybe just rare?
I’ve gotten him twice on the first day, and haven’t seen him since then. I don’t think the feature is broken, Boudewijn is meant to be rare.

I've gotten him every now and then, today as well. I keep losing to him 😆
I'd say it's pure chance if he appears or not?
I have gotten him seven times and won four. I think all y'all are just unlucky.
Anyways, this site feature is not broken.
been checking all mine and haven't seen him either. at least it's nice to know that some still see him
Aside from Boudeijwn, Quick Feet Buff seems more rare this year and in my case I tend to get more lounge trinkets than actual Steamwork ones. Since I vault mine, I have about 207 Lounge to 157 Steamwork since I've been vaulting them today

I've been going to the dance floor for just about every dance and he's only shown up 3 times for me so far. I don't know if there's a way for staff to increase or decrease the chances of him showing up compared to last year (which was more reasonable). I've also only seen him in the background once as well, last year he showed up in the background quite often. Maybe it has something to do with how active his NPC account is or something.
Maybe we could have an item that increases the chances of him showing up if we wear it, like how Morostide has items that reduce hex chances and increase the chances of finding minions in the pumpkin patch. I just really want the chance to get extra trinkets, and it would be annoying if I lose when he finally does show up for me again, and then I don't encounter him for the rest of the holiday X)
As others have stated - Boudewijn's duels are rare, and I received a duel with him yesterday, so he appears to be working normally.
If you would like to suggest how Boudewijn's duels can be increased somehow, please post your suggestion in the Suggestions & Ideas forum.