January 6th is a date celebrated throughout Spain. This is the Epiphany of the church calendar, the 12th day after Christmas, when the Magi arrived bearing gifts for baby Jesus. Traditionally children receive gifts on this day, brought by the three kings, Melchor, Gaspar, and Baltazar and is virtually as important Chrismas
In the days leading up to the 6th the children write letters to the Magi requesting a toy or gift they would like. On the 5th the three kings lead their procession through the streets, throwing sweets to the children. The next morning, the children wake to find their presents had been left overnight.
Everyone also eats Roscón, a sweet bread shaped like a wreath, with gláce cherries and sugar on top, a small plastic toy is buried inside, so don't eat too quickly. Whoever finds the toy gets good luck for the next year. They'll get double luck if they ate grapes at midnight on New Years Eve.
In the past Los Reyes Magos was as nearly as important as Christmas as this was the day when the children got their presents. However, as the children go back to school shortly after the Three Kings, a lot of parents now let Santa bring most of the children's presents and just a couple of special ones for the kings to bring.