The reason for the season is this:

Indeed, it is National Pizza With Everything (Except Anchovies) Day, and as such we are honor-bound to contrive a baseball tie-in. Said tie-in comes to us in the neatly packaged form of L'Affaire Pizza Toss at Fenway Park in 2007, Year of Our Lord. 

Come with us, won't you?

Here comes the pizza indeed. Nom, nom, nom.