S19E4 - Creating a Holiday for Worldbuilding

Look within your fictional cultures at their day to day lives. And ask what’s important to them. Some holidays come up whole cloth out of your world’s history and cultural diversity. If it was important to their view of history, it’s important enough to have a day set aside for it, with reenactments, good food, and traditional music, dance, and acting. - Robert A. Sloan