21 of the best events in the world to spot a billionaire

The world's richest people spend much of their time working to earn their fortunes, but there's always time for fun, especially when they appear on the guest lists for the most prominent film festivals, yacht shows, polo matches, football and soccer games, and tennis tournaments around the world.

Wealth-X, a company that conducts research on the ultra-wealthy, recently released its annual billionaire census, which explores the trends and habits of the world's richest people. The report reveals that the typical billionaire's social calendar is jam-packed year round.

From the fashion runways of London and Milan to a waterfront auto raceway in Monte Carlo, Monaco, read on to check out 21 of the biggest and best events frequented by billionaires.