Richard, good story and pix. I've experienced that kind of crazy Southwest weather and I don't think Easterners (like we used to be) really believe it until they see the pix.
I once had about 8" fall overnight while in a truck camper in the eastern Utah mountains in the spring and had to get out that morning. The snow was melting, but FS roads were slick and snow heavy branches were hanging low and we were worried more snow would come. We had no problem, but it was nerve wracking for a while. No snow had been predicted, of course. We stopped in a town for breakfast, and came out to see the truck tilted a bit—an improperly installed airbag had blown out. Limped home, eventually gave the airbag and camper back to the manufacturer and got most of our money back.
Your story is much better and with so many others there, must have been a good party! Up here, a big snow often leads to a snow day party.