The discussion of Yom Kippur here emphatically repeats God's command to "degrade yourselves" on that sacred day (source). And now you know the origin of karaoke.
Now this is really slick: Sukkot, the Festival of Booths. It is what it says on the tin—to this day, folks live in temporary structures modeled after the tent covering (that word again!) the Ark of the Covenant as the Israelites travel from Egypt to Canaan.
For pictures of how it looks in action, check out the gallery on Sukkot.com.
Last of all, the special assemblies. These get called at times apart from the Sabbath and regular holidays, typically so the people of Israel can watch movies as a reward for selling fruit to pay for the class trip to Canaan.