Tamagotchi Friends Holidays

[CheeWaWa]

I have had my Tamagotchi Friends for awhile now. I have 2 of them, and today I woke up and checked on both of them, only to see that their background changed! I think this is some sort of holiday, but I am not sure. 

I really would like to know every single one of them... or as much as you can find! I just want to be prepared so I will not be confused whenever I see them celebrating something AND so I cannot miss it too!