The popular burger chain opened its first restaurant in Baldwin Park in 1948 by Harry and Esther Snyder.
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"They were committed to serving only the freshest, highest-quality burgers, fries, and shakes, and these values continue to guide us today," In-N-Out said on Instagram.
The company has locations throughout California, Nevada, Arizona, Utah, Texas, Oregon and Colorado.
The all-day family-friendly festival kicked off at 10 a.m. at the Pomona Dragstrip.
It's set to future drag racing, a large-scale cars show with hot rods and muscle cars, unlimited carnival games and rides, delicious food and drinks, multiple music bands and In-N-Out Burger Cookout Trucks serving Double-Doubles made fresh to order.
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Proceeds from the festival will go to organizations dedicated to fighting substance abuse.
For ticket information, please visit ino75thfestival.com.