It would take a while to create a holiday event that can be added to the game and be continually added to as the goes on but the first step is finding out what holiday you guys would like to see next so I could at least start thinking about it in my spare time.
If you don't like what's on this list or you're from another country that has several holidays not listed here (and I'm sure there are tons), please pick "Other" and give me an idea of what they entail :)
Also, feel free to pick as many holidays as you like.
Let's give it a week!
New Year's Day
Day of the Dead