July 30 in Washington D.C. vs. Manchester United
Aug. 3 in Miami vs. AC Milan
Aug. 6 in Dallas vs. Club America
However, Messi, Alves and Mascherano will not attend because of the Copa America in Argentina, which ends July 24.
On a separate (and selfish) note, the Gold Cup finals will be played in Pasadena, CA. How convenient for me.