Supporters on both sides of the pond will be able to have their messages to the opposition kicked over the big drink and printed on a ball that will come out on the other side.
Here's how you can add your message:
U.S. fans can Tweet to @BallstotheBrits. People on the ground in LA (Universal CityWalk) can type a message on-site, have it printed on a soccer ball and fired from a billboard in Leicester Square, London.England fans can Tweet messages of, er, friendly encouragement to @BallstotheYanks. People on the ground in Leicester Square can do the same thing and have their message printed on a ball and shot out of a billboard at CityWalk.
How can you join in?
1. Join the Twitter conversation
2. Spread the word on Facebook
3. Attend in person / invite your friends
London: Leicester Square, 5p-9p BST
LA: Universal CityWalk, 10a-2p PST
Courtesy of the wieden + kennedy portland EA team.