From IHOP's site:
On March 4, 2014, guests from around the country will once again celebrate National Pancake Day at IHOP restaurants and enjoy a free short stack of Buttermilk pancakes*. In return for the free pancakes, guests will be asked to consider leaving a donation for Children's Miracle Network Hospitals... or other designated local charities.
*Only one free short stack per person. Don't be a terrible person and demand unlimited pancakes.
If the 22,000-plus people that retweeted this tweet yesterday are any indication, people are ready to scarf down those empty calories:
You can find more information about the deal at ihoppancakeday.com.