(CNN) – It's ladies' night in London. While her husband is dining with presidents and prime ministers at a Group of 20 pre-summit dinner, Michelle Obama has plans of her own Wednesday evening.
The first lady is set to attend a rival banquet for summit spouses hosted by British Prime Minister Gordon Brown's wife, Sarah. Mrs. Brown is expected to seat Mrs. Obama between Harry Potter author J.K. Rowling and Olympic champion runner Kelly Holmes at the reception at the historic 10 Downing Street in central London. Other attendees will include supermodel Naomi Campbell, British sitcom actress Ruth Jones, and Web site mogul Martha Lane Fox.
After the meal, prepared by celebrity television chef Jamie Oliver, Mrs. Brown is expected to take the women to the opera.
Mrs. Obama and Sarah Brown met for tea Wednesday morning and toured a cancer center in London. The first lady will join President Obama in the afternoon at Buckingham Palace to meet with Queen Elizabeth.