20,000 American visitors are in Dublin this weekend for a major football game.

The Croke Park Classic, which takes place tomorrow, will see University of Central Florida host Penn State in their 2014 Season Opener.

The event is worth up to €30m to the Dublin economy.

Croke Park Spokesman Peter McKenna says its a huge sporting spectacle:

To complement tomorrow's game, the United Nations Educational, Scientific and Cultural Organisation held a symposium at the Croke Park Conference Centre yesterday to discuss sport and the impact it has on young people worldwide. 

A game between high school teams the Penn Manor Comets and Cedar Cliff Colts will take place at the UCD Bowl this evening at 7pm, and can be livestreamed on Aertv.

There will also be 'pep rallies' held in Temple Bar this afternoon for both teams.

You can find out more about the events on the Croke Park Classic website.

If you're interested in following the game, make sure to check out the Newstalk guide on the players to watch.