On March 3rd is the day the Japanese celebrate Momo-no-sekku or Hina-matsuri. This is the day the families with daughters put out their traditionally dressed Japanese dolls and wish for their duaghters' health and happiness for the year. It is believed that dolls will take the bad luck from the girls.
This is also the day when we can enjoy sweets that are made espeicailly for this day. At our home, I made Tuna sushi balls and put them togehter like a little flower (top right on the photo below). Some people fix chirashi-sushi, sashimi fish on top of sushi rice, on this day.