Why are all the famous DJs in Vegas this humongous weekend?

What in the FEE-FI-FO-FUM world has made Vegas nightclubs and dayclubs go crazy this weekend? I mean, it's going to be a madhouse on the Strip. Just look at all the DJs setting up their rigs here. It's insanity. Is it because Sunday is Earth Day, or because poolside dayclubs are reopening? What the what, man?

THURSDAY: April 19: Dirty South at Tao. Joey Negro at Marquee Boom Box Room. Warren Peace & Mr. Bob at Haze. Que at Liquid dayclub.

FRIDAY April 20: Crystal Method at Liquid dayclub. Calvin Harris at Surrender. Martin Solveig at Tao. Gareth Emery at Marquee. Kelis sings at Rain after at dayclub Ditch Fridays pool party reopens at Palms. Dragonette performs at Hard Rock pool party. John Dalback at XS. Dave Aude at Haze. Keidy at Marquee dayclub. Fresh One at Vanity. D-Lux at Pure. (Actress Shayne Lamas appears at Chateau. Shaunie O'Neal appears at Gallery.)

SATURDAY April 21: Questlove at moon. Steve Angello at Encore Beach Club, then at XS at night. Arty and Madeon at Marquee. Avicii at Marquee Dayclub re-opening. Porter Robinson at Surrender. Starkillers & DmitryKO at Palms pool. Pauly D at Vanity. Lloyd performs at Haze. Quira at Lily. Menno de Jong at Chateau. Whoo Kid at Gallery. And Hard Rock pool’s nighttime Nectar Music Fest stars Basshunter, Vice, Jump Smokers, Hyper Crush, Richard Beynon, Jane Bang, Rock It! Scientists and Fitz and the Tantrums. Rye Rye at Lavo. Electropop duo Black Cards at Pure. Colleen Shannon at Bare topless dayclub. (MMA fighter Gina Carano at Tabu.)

SUNDAY April 22: Tiesto at Encore Beach Club grand opening (and Adam Levine's ex/model Anne V appears during Tiesto’s set). Hard Rock’s Rehab dayclub reopens with Pitbull and Pauly D. R3hab at XS. EC Twins at Marquee. Kevin Brown at ghostbar. Richard Beynon at Vanity. Vice at Lavo.

MONDAY April 23: Cobra Starship performs at Hard Rock's Relax dayclub pool party. Alesso at XS. Redfoo at Marquee. Que at Bare topless dayclub.

TUESDAY April 24: ATB at Lavo. Politik at Hyde.

WEDNESDAY April 25: Dada Land at Surrender.

FRIDAY April 27: Steve Aoki at Surrender. Avicii at XS. ATB at Marquee. Cee Lo at 1 Oak. Craze at Ditch Fridays at Palms. Ray J at Gallery. Keidy at Marquee dayclub. Disco Fries at moon. Tonite Only at Vanity. Mssl Cmmnd at Hyde.

SATURDAY April 28: Tiesto at XS. Kaskade at Marquee. Hardwell at Marquee dayclub. Bingo Players at Surrender. Lil Jon at Tryst. Kid Capri at Gallery. Disco Fries at Rain. Bad Boy Bill at Chateau. At Palms pool dayclub: EFX and other DJs. Melo D at Vanity. Singer Rita Ora at Lavo with DJ Reflex. Girl 6 at Lily. (Joey Lawrence at Chateau. Ben and Courtney from "The Bachelor" at Pure.)

SUNDAY April 29: Kaskade at Marquee dayclub. Sebastian Ingrosso at Encore Beach Club. Wynter Gordon at Vanity. Manufactured Superstars at XS. The Green Brothers at ghostbar.

MONDAY April 30: Hardwell at Marquee. Steve Aoki at XS.

TUESDAY May 1: DJ Stephanie Loayza with violinist Esther Anaya at moon.

WEDNESDAY May 2: Manufactured Superstars at Surrender.

FRIDAY May 4: Nero at Surrender. Audrey Napoleon at Marquee dayclub. Cosmic Gate and Nada Ali at Marquee. Tommy Trash at XS. Irie at Chateau.

SATURDAY May 5: Diddy at Rain. Paul Oakenfold at Surrender. EDX at Marquee dayclub. Erick Morillo at Marquee. Sultan & Ned at Encore Beach Club. Bass Kleph at Chateau. Roger Sanchez at Palms pool dayclub.

SUNDAY May 6: Tiesto at Encore Beach Club. Erick Morillo at Tao Beach. Markus Schulz at Marquee. Manufactured Superstars at XS.

MONDAY May 7: Diplo at XS. Eric D-Lux at Marquee.

FRIDAY May 11: Nero and No_ID at XS. Arty at Marquee dayclub. Joachim Garraud and Dedric Gervais at Marquee. Funkagenda at Surrender. Vice at Encore Beach Club.

SATURDAY May 12: Avicii and Glenn Morrison at Marquee dayclub and nightclub. Alvin Risk at Surrender. Robbie Rivera at Encore Beach Club. Evidence at Body English. Snoop Dogg at Vanity. Brett Rubin at Palms pool dayclub.

SUNDAY May 13: Nicky Romero at Marquee dayclub. The Drums at Body English. Miss Nine at Encore Beach Club.

MONDAY May 14: Nicky Romero at Marquee.

FRIDAY May 18: Calvin Harris at XS. Diplo at Surrender. Lupe Fiasco and Sky Gellatly DJing as The Soundclash at Lavo. Rebecca & Fiona at Marquee dayclub. Benny Benassi at Marquee. George Acosta at Encore Beach Club.

SATURDAY May 19: Chuckie at Marquee dayclub. Ferry Corsten at Marquee. Bingo Players at Surrender. R3hab at Encore Beach Club. Tydi at Palms pool dayclub.

SUNDAY May 20: Above & Beyond at Marquee dayclub. Manufactured Superstars at XS.

MONDAY May 21: Redfoo at Marquee.

THURSDAY May 24: Alesso at Tryst.

FRIDAY May 25: Tiesto at XS. Sebastian Ingrosso at Encore Beach Club. Benny Benassi and Fedde le Grand at Marquee. Cosmic Gate at Marquee dayclub. Afrojack at Tryst. (Playmate Jessa Hinton at Crazy Horse III’s Posh.) And Bagatelle Beach & Nightclub opens at Tropicana for Memorial Day Weekend.

SATURDAY May 26: Skrillex at Tryst. Max Vangeli, AN21 and Steve Angello at Encore Beach Club, then at XS at night. Busta Rhymes at Palms pool dayclub. Chuckie and Cedric Gervais at Marquee dayclub. Above & Beyond at Marquee. (Playmate of the Year Claire Sinclair takes her 21st birthday party to Crazy Horse III strip club and its Posh club-lounge. UFC’s Urijah Faber at Tryst.)

SUNDAY May 27: Deadmau5 at XS. Kaskade at Marquee dayclub. Armin van Buuren, Gareth Emery and Blake Jarrell at Marquee. Erick Morillo at Tao. Lil Jon at Tryst. Disco Fries at Rain.

MONDAY May 28: Deadmau5 at Encore Beach Club. ATB, Sunnery James and Ryan Marciano at Marquee dayclub. Avicii and David Guetta at XS. Nicky Romero and Vice at Marquee.

FRIDAY June 15: Lupe Fiasco and Sky Gellatly DJing as The Soundclash at Lavo.