I think there was a thread about holidays somewhere around these forums. Anyway, I have a bunch of holidays inspired by real life events, like winterfest eve and winterfest day, 1st day of spring, spring cleaning day followed soon by easter bunny. I have a hot dog day, inspired by 4th of July, with bbq and fireworks, a health day where sims do excercise and fitness stuff as they can't run a marathon. I have a sport championships day where they watch sports channel and drink and sing. When there was an issue with Santa, I edited winterfest and now my sims celebrate with the menorah.