Memorial Day For The Dead Of Radioactive Accidents And Catastrophes
I think Chernobyl blew up on this day. I can't remember, though. I shouldn't have eaten those Ukrainian vegetables from the market.
Celebrate the day properly by carefully remembering each and every person who ever died from radioactive accidents and catastrophes. Do not slack on the catastrophes in favor of the accidents. Do not neglect the accidents in favor of the catastrophes.
Do this faithfully and you have very little to fear when the radioactive zombies come.