The Little Brown Jug and The Little Brown Jugette are annual races in Delaware, Ohio, for what?

Question

What annual event, held on a Monday for children and their parents, that was started in 1814 by First Lady Dolley Madison in the grounds of the Capitol, Washington DC, USA, is now held on the White House lawn?

Answer 1

Three-year-old pacing standardbreds
The races are harness races, The Little Brown Jug for colts, first raced in 1946, is named for a pacer who won nine consecutive races. He became a USTA Hall of Fame Immortal in 1975.