Hii-yammander!!She shouts "chiree!", which is notably similar to her "shiree" she calls the admiral/commander.October 12th*roll**CRACK*It is called the Columbus Day in the United States.
See also its Wikipedia page.
It is also called the Discovery Day in the Bahamas. (Columbus found the island Guanahani, inside The Bahamas.)
The girls are trying to stand an egg on its end, which is an apocryphal story about Columbus. The answer is to break the egg, like Ushio does.
*SLAM*Today is Egg day.*roll*d'aww*shatter*