On Tuesday, the International House of Pancakes will celebrate National Pancake Day by offering guests a free short stack of buttermilk pancakes. With every short stack of pancakes served, diners will be invited to make a donation to designated charities, including Shriners Hospitals for Children.The IHOP restaurants that have chosen Shriners Hospitals for Children as the beneficiary of this event are primarily in Texas, with additional locations in Arkansas, Colorado, Louisiana, New Mexico, Oklahoma and Wyoming.