And for bonus points, was the player a child?
I never have, and as far as I know that was never a thing that ever happened in Springfield, Illinois between 1982 (when I learned to play chess) and 2014 (when I moved away).
I don’t recall ever seeing it and hearing about it happening in the 80s in New Jersey.
At the states and in the club, for fun, I did take on up to 5 opponents at once, but it was speed chess. The 5 at once one, we had 5 minutes each. The boards were set up in a U so I could just pivot. I won 4 out 5, so not bad. Please note, I was a mediocre player, I never got to even a 1700 rating. But I was really good at speed chess. No ratings or glory for that though.
Blindfolded simul? No.
As the guy that ran an elementary-level chess club for a few years, we brought in an outside coach (NM-level, I believe) and he could easily beat all of our players simultaneously - which he did many times. He also beat our stronger players blindfolded (well, facing away from the board) multiple times. But never both at the same time.
I have played blindfolded and I have played small simuls, but I have never played a blindfolded simul. This was all informal and just fun handicaps to apply when playing with new players. (I wouldn’t hold up very long playing blindfolded against anyone with notable chess experience.)
I’m going to try and get @glee’s attention.
He’s was a chess teacher.
Did somebody call? 
Blindfold chess is hard - really hard!
When I was rated over 2200 ELO, I could just manage two games (one with White and one with Black..) I certainly wouldn’t have played up to my rating in either.
Some snippets…
- it’s pretty tiring and I didn’t sleep well that night
- world class players have managed around 30 such games
- playing chess at all involves visualising ahead (so the beginning of blindfold chess)
- if the other players conspire, they can make it incredibly difficult*
*they play similar openings, but with slight variations
Not blindfolded, but I did play in a simultaneous match against a master when I was around 12 years old. He clobbered me, or course; but it gives me a Morphy Number of 6.