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Chicago hosts plenty of music festivals, but the granddaddy of them all plays out this weekend in Grant Park.

It’s the 25th anniversary of the mega-festival Lollapalooza. In honor of its quarter-century anniversary, the festival runs four days this year (Thursday, July 28 through Sunday, July 31) instead of its traditional Friday-to-Sunday run.

With headliners that include Lana Del Ray, Radiohead, the Red Hot Chili Peppers and LCD Soundsystem, the festival is expected bring roughly 100,000 fans to the park each day.

With the festival underway, we searched the web to compile what you need to know when it comes to who to see, what to eat and more. Happy listening at Lolla!

Where to get tickets

Four-day passes and single-day tickets sold out in March, within minutes of being released. If you weren’t lucky enough to get tickets, there are options – albeit they usually involve a bit of a time and money investment.

Sites such as StubHub.com, LiveNation.com and Ticketmaster.com allow fans to resell their tickets that can’t be used, but the passes often come at a price above face value ($120 for single-day tickets and $335 for a four-day pass.)

As of Thursday’s opening day, single-day passes were selling on such sites for more than double face value.

Who to see

With 171 bands on eight stages, the Lolla lineup, is about choices – especially when two good bands are scheduled at once.

Who to see is a matter of personal preference, but for those who need suggestions, there are countless must-see lists. Here are just a few:

USA Today suggests checking out many of the headliners

The Chicago Tribune polled music bloggers and more to get their thoughts

Time Out Chicago advises seeing headliners, plus many more

For those who don’t want to brave the heat or the crowds, there’s the option of streaming the festival live online here.

What to eat

Chi-town is a food town, and that’s especially true at Lolla.

Dancing and racing stage-to-stage is enough to work up an appetite. No worries. Many local restaurants have booths on-site At Chow Town, giving concert-goers a true taste of the Windy City.

Curated by famed Chicago Chef Graham Elliott, the offerings include lobster corn dogs to Windy-City-createdRainbow Cones to ketchup-free Chicago hot dogs.

Best-of lists are likely to emerge throughout the weekend – for both the music and the food.

In the meantime, Michigan Avenue Magazine compiled a preliminary what-to-eat list.

Here’s a look at some favorites from last year – many of which have returned to Chow Town.

Hungry after the shows end for the night? Eater Chicago compiled a go-to guide to nearby restaurants.

Where to after-party

For those who want to see bands on the Lolla lineup in a smaller setting – or those who just want to keep the party going – after-shows are held nightly at bars and music halls across town.

Many are sold out, but for a full schedule, take a look at the lineup here.

Need guidance on where to go? Time Out Chicago put together its own after-show guide.

For sold out shows, try sites such as Stubhub and LiveNation for resale passes!