Opera singer Katherine Jenkins sang God Save The Queen after the first race of the day, the John Smith's Aintree Legends Charity Race.
The Welsh mezzo-soprano said: "As a child, I remember my parents placing nominal bets and us all cheering on the horses from our living room. To be involved in such an important milestone for the race is a great honour and something I am proud to be a part of."
Jump jockey Ryan Mania has had an extraordinary few days that have included winning the Grand National on a rank outsider.
Big outsider Auroras Encore won the 166th Grand National at Aintree cruising to a comfortable victory in the world's most famous jumps race.
Sport fans are waiting to see if the Grand National, the world's most famous steeplechase, will get its first female winning jockey.