Champagne, superyachts and water fights: A startup CEO reveals what it's like to party with Sir Richard Branson on his private island

· Every year, Richard Branson hosts the Necker Cup, a tennis tournament hosted on the private Necker Island.
· The tournament has hosted matches between Rafael Nadal and Novak Djokovic, and involves pro tennis players being paired with amateurs to compete for the Necker Cup.
· Stacey Wilkinson, an entrepreneur from...