If you can’t find a restaurant that accepts payment in BTC, try to get a restaurant owner who would be interested in crypto. If you happen to find a Bitcoin enthusiast they would totally love to get funded through a pizza delivery. I think that will be the best way to celebrate Bitcoin pizza day.
If I ever open a shop in my neighborhood this is the first thing I advertised outside the door of my shop to further promote bitcoins in our city since it is already known here, it's better to light things up even more by doing such things because it may be the first step to push the other stores and shops to do so as well. Right now we are in the era of promoting bitcoin so that it might become one of the official currencies all around the world with less volatility and as an enthusiast you can also help on your own way.