The three wise men are called the three magician kings in Spanish. They took 12 days after Jesus birth to finally reach Him and present their gifts at His feet.
Today, January 6th (the 12th day of Christmas) all the kids (and young at heart ;) ) that leave a pair of shoes (yes, sport shoes will do as you can see from the picture) outside their door will receive a gift.
¡Llegaron los Reyes! (The Kings have arrived!) is heard all over the country veeeeeery early in the morning.