CHICAGO — Less than a month after a gunman climbed a fire escape and positioned himself on a rooftop to fire rifle rounds into a mass of Independence Day paradegoers below in Highland Park, Chicago officials said they are confident they can keep one of the city’s largest festivals safe this weekend. Lollapalooza starts Thursday in Grant Park, showcasing more than 170 acts and hosting hundreds of thousands of people. Rich Guidice, executive director of Chicago’s Office of Emergency Management and Communications, said the city has been developing and building on its security plans around the fes…
