EMBED >More News Videos Are you ready for 4 days of non-stop music? Here's what you need to know about Lollapalooza!

EMBED >More News Videos Lollapalooza returns to Grant Park on Friday for four days of live music, and this year there are new rules and tighter security in place.

CHICAGO (WLS) -- Lollapalooza returns to Grant Park on Thursday for four days of live music, and this year there are new rules and tighter security in place.Lollapalooza will be held Thursday, August 2, through Sunday, August 5, in Grant Park. Headliners include The Weeknd, Bruno Mars, Jack White, Arctic Monkeys and Travis Scott.The festival will be open from 11 a.m. to 10 p.m. each day. All ticketholders can reenter the festival three times each day. Click here for more information on this year's performers.About 100,000 people are expected to attend each day of Lollapalooza. Security at the festival will be tighter than it has ever been before. There will be additional concrete barriers, new item restrictions, airport-style screenings and an increase in undercover police officers."I want to multiply times four the amount of covert officers who are going to be inside. So these are going to be guys who are going to be wearing shorts and t-shirts, carrying backpacks, listening to music just like any other concertgoer," said Chicago Police Deputy Superintendent Anthony Riccio."We have four times as many plain clothes officers that will be there. We've talked to the businesses and hotels in that area and we'll be looking at rooftops and we'll be looking from the sky so we have enhanced security out there this year," said Chicago police Superintendent Eddie Johnson.The security enhancements come in part as a response to the October 2017 mass shooting at a Las Vegas music festival in which 58 people were killed and more than 800 were injured by a lone gunman who opened fire from the 32nd floor of the Mandalay Bay Hotel and Resort.It was later revealed the same gunman had reserved two rooms at the Blackstone Hotel on Michigan Avenue during Lollapalooza 2017. He never showed up."We have met with the Blackstone on numerous occasions this past year, most recently last Friday, so we have been in contact with them. We're comfortable with the plan they have in place," said Rich Guidice of the Office of Emergency Management and Communication. "We talked about making sure you know who's coming to your hotel, making sure you're at least once a day checking inside all of these rooms."City officials said the same conversation has been had with every hotel lining Grant Park. They said while no credible threat has been leveled against Lollapalooza, they have to be ready for every possible scenario."We're going to have spotlights shining in those hotels and we have plans in place that if there was some sort of a similar type event, we have people right on site to storm the room and take out the threat immediately," Riccio said."For them to be vigilant in terms of what people are bringing in and out of the hotels. Public safety is everyone's responsibility," said Supt. Johnson.Although festival organizers say fans are not allowed to bring in alcohol and the city promises to strictly enforce laws against underage drinking, some area hospitals are preparing for increased number in ERs of medical emergencies related to binge drinking."There is just a dramatic rise in alcohol-related visits to emergency rooms throughout the city of Chicago during Lollapalooza weekend," said Dr. Robert Tanz with Lurie Children's Hospital.As in years past, all bags with be searched by security before they are allowed into the festival. This year, however, backpacks are not allowed; only single-pocket drawstring bags, small purses and tote bags will be allowed into the festival.Attendees who are bringing no bag can enter through a no bag express security lane. Anyone with a bag must enter through the bag lane, and should expect delays.This year attendees will also not be allowed to bring any outside liquids into the festival. Empty containers and hydration packs will be allowed. Free water will be provided throughout the festival at hydration stations."We're added even more free water filling stations throughout the park so we encourage everybody to bring a refillable water bottle," said Lollapalooza spokesperson Brooke Leal.Mayor Rahm Emanuel said that in response to the changes, 20 percent more hydration stations will be located throughout Grant Park.Cooling buses will also be available at the festival.Street closures go into place Monday night. The following streets will be closed through Thursday, August 9, due to the music festival:- Columbus Drive from Monroe Street to Roosevelt Road- Balbo Drive from Michigan Avenue to Lake Shore Drive- Jackson Boulevard from Michigan Avenue to Lake Shore Drive- Congress Parkway from Michigan Avenue to Columbus Drive, including Columbus CircleJackson Boulevard from Columbus Drive to Lake Shore Drive will remain closed through Wednesday, August 8.Metra and the Chicago Transit Authority will be adding service and expanding capacity to help attendees get to Lollapalooza.Metra will provide extra trains and adjust schedules on most lines to help accommodate demand, officials said. The CTA will add service on rail lines and bus routes, including those that bring riders to Grant Park from Union Station and Ogilvie Transportation Center.From Union Station, attendees should take the #126 Jackson bus to Grant Park. From Ogilvie Transportation Center they should take the #J14 Jeffrey Jump bus to Grant Park. CTA and Metra will place signboards to help riders find the correct bus, and buses will have signs in their windows indicating they are heading to Lollapalooza. Click here for more information about Metra service for Lollapalooza. Click here for more information about CTA train and bus service for Lollapalooza.For more information about Lollapalooza, click here