When my children were small we celebrated this holiday by talking with our mouths overly full of food, with our elbows on the table, chewing noisily with opened mouths, leaning our chairs back on their two back legs, and belching as loud as we could to say we liked the meal. We held our plates up to our lips and shoveling in the food.
We laugh a lot and talked about customs in different countries and etiquette we should use in fine restaurants. The countries we talked about were noted in various places on a time line hanging covering a great deal of our living room wall. As we heard classic music, throat singing, koto music, read great books, learned about inventions, and events in history we cut out pictures of these things and glued them to the time line.
As well as Bad Manner Day we celebrated German Week, Japanese Week, and others where we attempted to make foods from these countries. We talked about their customs, clothes, books, stories, art, and history and on Saturdays we’d visit an associated restaurant, using good manners. Learning was fun.  nancymauerman.com