Many of the national food holidays that we feature here at Slashfood don't have a web page that celebrates the day. The day just "exists." But it's really great to find a day that people on the web actually celebrate with a forum and recipes. Like this one at RecipeZaar for National Angel Food Cake Day.
Check out their recipes for basic Angel Food Cake and one for Paul Newman's Chocolate Orange Angel Food Cake. Food Network has one for Maple Angel Food Cake, and MedicineNet.com has a lighter dessert you can try, Chocolate-Mocha Angel Food Cake.