William & Kate Set a Glamour Date for Next Week
05/31/2011 AT 08:45 AM EDT
The June 9 event will take place at Perks Field, a stone's throw from Kensington Palace, William's childhood home with his mother, Princess Diana. In a statement, the palace says that the princes' foundation and ARK "share a common vision and commitment to transform the lives of disadvantaged children in the U.K. and around the world."
The couple's appearance will be in recognition of "ARK¹s work and achievements on behalf of children around the world as the charity commemorates its 10th year."
It is also expected that William will announce a collaboration between his foundation and ARK, an insider tells PEOPLE. The foundation was established in 2009 as a fundraising body, which aims to distribute money to causes close to the princes' hearts.
Uma Thurman's on-off boyfriend, Arki Busson, is one of the leading lights in ARK and sits on its international board of trustees.