John will be in Washington DC this Saturday for the 'gala'.
I'm guessing as the guest of Arianna Huffington?
>note - you need to scroll all the way to the bottom of the article
"Also expected at various media tables are Garden State tween heartthrobs the Jonas Brothers, Hayden Panettierre, John Cusack, Claire Danes, Rob Lowe, Marcia Cross and Tracey Ullman."