By now, people know to be on the lookout when they get to the Coachella Valley Music & Arts Festival.

For what? They’re keeping an eye out for signs, like a suspicious-looking door that seems out of place or a line of people outside some unmarked spot.

These are some of the clues they look for when trying to find the hidden bars that have become part of the fabric of the festival.

“They’re super low-pro and it’s just a real fun moment for our patrons,” said Adrian Garcia, the food and beverage director for Goldenvoice Festivals who puts together the hidden speakeasy bars.

This year, festival goers had to find two hidden bars, but — surprise! — there was a third bar hidden inside one of those secret spots. And each requires a password that changes daily, so there was detective work and clue-solving in order to get in.

“The password changes every day, and they kind of spread organically, word of mouth,” Garcia said as he stood at the Pies & Lows pizza spot.

To the right of the counter, there’s a farm-style sliding door under a red neon sign that read “The Basement.” Behind that door was a long twisted corridor that led to a black door. Inside that door was a 1970s-inspired bar that’s meant to evoke a garage where young people might go to party.

Music blares inside the dark spot, which is decked out with a long cushion for seating on one side and a small bar on the other. On the walls, glow-in-the-dark posters depict psychedelic images, cartoonish pictures and, of course, an image of Cheech and Chong.

“It’s a cool, nice getaway from the hectic stuff and the heat,” said Ara Devejian, who was able to guess the password after the doorman gave him some clues.

A short walk away near the Yuma tent revealed another clue for those seeking the hidden bars: A wood shack decorated with a palm leaf-covered roof. The door next to that is the entrance to Cocktails & Dreams, a two-in-one hidden bar combo that included PDT Tropical from New York City-based Please Don’t Tell bar, and Sonny’s by Attaboy, an ‘80s-themed Miami Vice bar.

People first enter PDT Tropical, which is an outdoor beach-style bar with wood barrel tables under umbrellas and a Tiki-style bar. On one side of the outdoor bar another door leads into Sonny’s Attaboy, which last year was located at the Indio Central Market.

There are retro tunes playing and artificial leaf wall panels, as well as flowers, pink flamingos and a dance floor lit up from below. This is definitely a party bar for those who have found the spot, like Arizona resident Nina Mendez, who did some homework before coming to Coachella.

“I looked up on Reddit and found out about it. If you come to Coachella every year, you’re going to know there are hidden spots and that’s how I figured it out,” said Mendez, who also figured out the password on Reddit.

But she said she wasn’t giving the information up to anyone at Coachella who may ask her about it.

“It’s a secret; you have to work for it. But I love that it’s hidden and I like the disco mood,” Mendez said. “It just adds to all the fun.”