April Fools' Day is very similar to the Korean
festival/day:
만우절(萬愚節)
say: /mahn-oo-jeol/
which literally translates thusly:
Mahn = "Unexpected"
Oo = "Fool"
Jeol = "Festival"
And, it is similar to the Chinese festival/day:

say: /yu2 ren2
jie2/
which literally translates thusly,
Yu = "Fool(ish)"
Ren = "Person"
Jie = "Festival"
The objective in Korea is slightly different than in North America. As I
understand it, in Korea, students usually try to fool their teachers, literally
making a fool out of them. It's all in fun, of course. In North
America, however, people try to play tricks on their family and friends.... and,
maybe teachers, too. But mostly people (not only children) try to
fool/trick their loved ones. Again, it's all in fun. Chinese seem to
do the same as the Americans on this day.
I hope you have a Happy April Fools' Day!
Sincerely,
Leon.