Epiphany, also celebrated as Three Kings' Day. Latin American Catholics in the neighborhood (and around the world) celebrate it with a big procession of people dressed as the Three Wise Men, Jesus, Joseph, and Mary, and more, complete with donkeys and sheep.
The procession goes down 14th and ended with a performance at the Gala Theatre, plus free churros and hot chocolate. A reader snapped this picture of the animals at 14th and Irving, and Mr. T in DC snapped some of the procession last year. The reader says more animals showed up a bit later.
Always like to see interesting cultural traditions like this.