Jan Kruis once came up with a special holiday in his comic (Jan Jans en de Kinderen). The idea behind this was that one of the characters (opa) didn't want to eat beans but pancakes instead. He came up with Sint Pannekoek as an old tradition on the 29th of November. Now we celebrate it every year with thousands of people!
Pancakes are gender neutral and not racist, so it's a nice, cheerful and easy celebration where everybody comes together!