The event will be Kate's first public outing since her hospital visit with acute morning sickness and the ensuing hoax phonecall scandal.
[Duchess of Cambridge and Prince William leave King Edward VII hospital]
The Duchess will present two awards during the ceremony, according to BBC Sport.
BBC Breaking News tweeted: "Now then, this is a bit of exciting, royal, breaking news. The Duchess of Cambridge will be in attendance tonight in her first public engagement since leaving hospital for severe pregnancy sickness. The Duchess will present the main award and the lifetime achievement award."
Kate was expected to attend the Hobbit premiere in London last week with Prince William but was forced to pull out because of her illness.