From http://www.tilc.ac/updates04.htm

This is a traditional custom which is followed on "Setsubun" which is a term originally referring to the day before each of the seasonal divisions (risshun, rikka, risshu and ritto) which represent the midpoints between each equinox and the solstice preceding and following it.

Nowadays, it refers only to the day before risshun, which is about six weeks before the spring equinox, or February 3rd or 4th on the solar calendar. Some modern day events to celebrate Mamemaki include the ritual of opening the doors and windows of houses and expelling bad luck and evil demons by tossing beans (mostly soybeans) into the air while saying "fuku wa uchi, oni wa soto" ("fortune in and demons out"). In addition to the soybeans thrown out the door, roasted soy beans are spread around the (cleaned) floor. Family members then pick up and eat a number equivalent to their age to ensure health and luck in the coming year.

At SFVJLI Mamemaki will be celcbrated during the school assembly on February 5th .  The children who were born in the year of the Rooster will be throwing soy beans and peanuts to celebrate Mamemaki.