India, June 20 -- Kate Middleton's arrival during the Royal Procession has become the scuttling subject of the Royal Enclosure, as Royal Ascot racegoers wonder where she is.

Guests were eagerly expecting to see her by Prince William's side, especially since it was such a huge day for the couple. William was set to present the trophy for the Prince of Wales's Stakes, and close friends had been invited to join them in their box for the occasion.

Among those present were property developer Thomas van Straubenzee, godfather to Princess Charlotte and his wife Lucy, who teaches at the London school once attended by Charlotte and Prince George. Also in attendance were James Meade, one of William's longtime friends from Eton, and Sam Waley-Cohe...