Hola, es una festividad religiosa católica, que se celebra en España y en los países hispanohablantes. The anglo saxon culture doesn´t have this celebration, it´s the Epiphany ,or The Three Wise Men´s day,or The three Kings´s Day,the day when the three Kings went to visit Jesus,and brought him presents.
So our children get presents twice,for Christmas, and for "Día de Reyes".