From this link:
The Phillies will have the rare fortune of playing 84 regular-season games on their home field this year.
The Toronto Blue Jays and Major League Baseball announced Tuesday that they have moved the June 25-27 series against the Phillies from Rogers Centre in Toronto to Citizens Bank Park in Philadelphia because of the G20 Summit.
"After reviewing all of the options with the parties and taking all of the security considerations into account, it was determined that the best course of action is to play the series in Philadelphia," Commissioner Bud Selig said in a statement. "I appreciate the cooperation of the Blue Jays, the Phillies and all of the parties who have helped resolve this challenging situation."
The G20, which hosts many of the world's political and financial leaders, is scheduled to be held June 26-27 at the Metro Convention Center, and there are massive security and congestion issues with the two sites just feet away