The 99 brought back their Red Sox promo. How it works? It's easy. If the Red Sox win, the next day, you'll receive a free kids' meal with the purchase of an adult meal.
Just note - that it has to be an even purchase. If you have 1 adult and 2 kids, you'll only get 1 kids' meal for free. If you have 2 adults and 2 kids, both kids' meals are free. 2 adults and 5 kids - you're out of luck - you'll still have to pay for 3 kid's meals. Get it?