You are a day too early, I believe bitcoin pizza day is tomorrow May 22. It’s nice to see this historic transaction has become a traditional event for those in the crypto space. I wonder if people around the world celebrating actually buy pizza with bitcoins that day. For me, the best to celebrate bitcoin pizza day is buying something physical with bitcoins.
Maybe op's time is different and didn't use the Bitcointalk forum's time zone. In my country, it's already May 22 at dawn so I would also say that it is pizza day. It's been so long since I had eaten a pizza and I would like to eat one now 
. I wonder if there's a shop in my country where I can buy pizza with Bitcoin even though it's not the same as the OG. As if you are the one who bought pizza with that kind of amount of Bitcoin.