Carb Day 

Indy 500 is 1 Day, 20 Hours and 4 Minutes away!! Today is Carburetion Day.  What?  Let's go to Wiki.....

The final practice session before the race, currently held on the Friday before race day, is called "Carburetion Day" (shortened to "Carb Day" since 2000). The name originally came from the fact that it was the final session where teams could tune their carburetors in conditions similar to those that may be encountered on race day. The name has remained despite the fact that no qualified car has used a carburetor since 1963. A pit stop competition, a concert, and the Firestone Indy Lights Series Freedom 100 are also currently held on Carb Day.