The trick - you have to wear a cowcostume to the restaurant.
"Chick-fil-A teased the event on twitter saying, "#CowAppreciationDay is only a few days away, do you think that's what this is referring to?
All you have to do is show up dressed like a cow (or any sort of cow apparel, really) and you'll get a free entree.
In honor of their fifteenth annual Cow Appreciation Day, the fast food chain is encouraging people to turn to their chicken-filled menu. Children wearing cow clothing will receive a free kids meal.
Anyone who visits a Chick-fil-A restaurant dressed as a cow will receive a free entree (excluding salads) at Chick-fil-A's more than 2,400 locations nationwide.
The freebie includes: an Egg White Grill or Chicken Biscuit at breakfast; or an Original Chicken Sandwich or Grilled Nuggets at lunch or dinner.
Chick-fil-A has more than 2,400 stores across the United States, so you have your pick of locations.
Chick-fil-A is famous for the "Eat Mor Chicken" cows, and this year's Cow Appreciation Day marks the 24th anniversary of the marketing campaign, Jon Bridges, Chick-fil-A's senior vice president and chief marketing officer, said.