Same thing happened to me. It was a piano/voice recital (5 of the vocal teacher's students, 15 of mine). The songs were all 3-4 minutes, and half of my students only played 40 second pieces, so the time balanced out well.
I accompanied 2 older singers and the voice teacher (pop-rock music, so it was really fun because I got to do whatever I wanted

), and I played a solo piece after, and they all went fine. 1/2 of my students made REALLY dumb mistakes, as in starting on the completely wrong notes, and continuing to play without even fixing anything - then 30 seconds later restarting; or stopping for like 20 seconds staring awkwardly then restarting the piece!
I even held mock 'recital' settings, and would have 4-5 people sit in the room while some of my students would play in the lessons leading up to it.
The main reason students said they messed up was because "the piano sucked", but I can't accept that as a reason! It's ridiculous. I noticed a trend that the kids who had to REALLY practice in the last few days to make their piece decent butchered it at the recital. The kids/adults who actually practice regularly and enjoy playing didn't make any big mistakes (some slips here and there but they were confident enough to play through them. I appreciated that a lot!)
It's impossible for me to hold a perfect recital, because the parents who are super into it unfortunately have lazy-a$$es for kids who don't want to do anything but eat extra cheesy doritos and watch Glee (I'm not knocking the show, just an example). These kids come to the recital, brutalize a 1 minute piece for 2 minutes, and then complain about the piano.