A 53-year-old man was stabbed in the chest near the Lollapalooza grounds while re-selling tickets to the sold-out festival Friday evening in downtown Chicago.The Chicago Sun-Times reports that the attack happened just before 7 p.m. on the corner of Adams and Michigan -- just two blocks from an entry gate to the Grant Park mega-festival.A group of young men had approached and attempted to rob the victim of his tickets, according to the Chicago Tribune.