Zac Efron made time for his rabid fans at a Tribeca Film Festival party for his movie “At Any Price.” The heartthrob held up his security team at the McKittrick Hotel when he was nearly ushered past waiting fans into the party. “Zac held up a finger” to his guards, and “greeted his fans to pose for pictures and answer questions,” said a spy. He later headed inside the Heineken-sponsored party to mingle with guests, including Dennis Quaid and Heather Graham, who danced to a live soul band.