Back in the 1980s, Pizza Hut used to host birthday parties where the birthday person, not their entire party, got to make their own pizza. That was a popular activity that likely helped inspire the current wave of make-your-own pizza chains. The Pizza Hut party actually allowed the birthday boy or girl to handle the dough, sauce, cheese, and add their own toppings. Today's make-your-own pizza chains, led by Blaze Pizza, with over 350 locations nationwide, and Mod Pizza, which has about double that, don't ...