Looks like somebody got pissed and decided to take their ball and go home.

 Customers left without Thanksgiving meals after Rancho Cucamonga Boston Market sees no-show of workers

I have no idea why the workers left. But I can see that either pro-revenge or malicious compliance could be at work here.

But no matter, the people expecting meals got screwed badly, and I think there should be some sort of punishment to the workers.