February 28, 2012
Since beginning its National Pancake Day celebration in 2006, IHOP has raised nearly $8 million to support charities in the communities in which it operates. On February 28, 2012, guests from around the country are invited to celebrate National Pancake Day at IHOP and enjoy a free short stack of Buttermilk pancakes.* In return for the free pancakes, guests are asked to consider leaving a donation for Children's Miracle Network Hospitals© and other designated local charities."
You can find a IHOP using their locator page.
Offer is good at participating restaurants for dine in only, while supplies last. As always, I recommend calling before you go to make sure that they are participating.