Rio,
Most companies that have a big investment in the Games are insured with Lloyds of London or somebody to protect themselves in the event the Games don't occur.
You can do the same thing easily if you can get enough action on the prop to warrant it.
Then, have your marketing department contact every sports writer in the States by email, informing them of the prop. Eventually it will get major media attention and Rio gets a ton of free advertising.
I expect my $1000 free account ready for Game 6 for running your business for you.