We've been having a similar issue with some of our work with the senior class. In the past, we've had a Senior Breakfast, a Class Day on the penultimate day of school, a Prom Fashion Show, a Senior Auction....and many other smaller events that haven't materialized this year. In some cases, the students simply didn't see interested, but it other cases, there seem to be a constant string of excuses on why things can't happen. (Some are legitimate, but others confuse me). While I feel guilty at first, eventually I eventually just have to throw my hands up and say maybe it's not worth the hassle. We'll make the best with what we have, but sometimes when the answer is "no", there's no sense in fighting it.
Either way, it's been a day of taking a step back and resting before recalibrating for the rest of the year. Dare I say it, I'm almost excited to get back to work tomorrow. I had forgotten how boring sick days can be.