Question: The Cheek to Cheek Tour was a co-headlining tour by American singers Tony Bennett and Lady Gaga in support of their album, "Cheek to Cheek" (2014), the tour, which began with a two-night run at the Cosmopolitan of Las Vegas,  a luxury resort casino and hotel on the Las Vegas Strip in Paradise, in which state?

Context articles: Tony Bennett and Lady Gaga: Cheek to Cheek Live!
The Palazzo
Cosmopolitan of Las Vegas
Trump International Hotel Las Vegas
Encore Las Vegas
Cheek to Cheek Tour
Cheek to Cheek (album)
Tropicana – Las Vegas Boulevard intersection
Future Now Tour
Wynn Las Vegas

Tony Bennett and Lady Gaga: Cheek to Cheek Live!
 is an American concert television special featuring live performances by Tony Bennett and Lady Gaga in support of their collaborative studio album, "Cheek to Cheek", released in September 2014.
 It was held at the Rose Theater of Lincoln Center for the Performing Arts in July following the announcement of the album's release, and was aired on PBS on October 24, 2014, as part of the network's "Great Performances" series.
 The concert was watched by an audience consisting of invited guests and students from New York schools.
 Bennett and Gaga were joined on stage by 39-piece orchestra and jazz musicians associated with both artists.
 A number of costumes were worn by Gaga, provided by designers including Roberto Cavalli, Michael Costello, Mathieu Mirano, Valentino as well as David Samuel Menkes.
 The special received one nomination at the 67th Primetime Emmy Awards.
The Palazzo is a luxury hotel and casino resort located on the Las Vegas Strip in Paradise, Nevada.
 It is the tallest completed building in Nevada.
 Designed by the Dallas based HKS, Inc., the hotel offers luxury in an Italian Renaissance ambiance.
 The hotel and casino are part of a larger complex (operated as one hotel) comprising the adjoining Venetian Resort and Casino and the Sands Convention Center, all of which are owned and operated by the Las Vegas Sands Corporation.
The Cosmopolitan of Las Vegas (commonly referred to simply as The Cosmopolitan or The Cosmo) is a luxury resort casino and hotel on the Las Vegas Strip in Paradise, Nevada.
 The resort opened on December 15, 2010, and is located just south of the Bellagio on the west side of Las Vegas Boulevard.
The Trump International Hotel Las Vegas is a 64-story luxury hotel, condominium, and timeshare located on Fashion Show Drive near Las Vegas Boulevard, just off the Las Vegas Strip in Paradise, Nevada, named for real estate developer and the 45th and current President of the United States Donald Trump.
 It is located across the street from Wynn Las Vegas, behind Alon Las Vegas on 3.46 acre , near the Fashion Show Mall, and features both non-residential hotel condominiums and residential condominiums.
 The exterior glass is infused with gold.
 The hotel is a member of The Leading Hotels of the World.
Encore Las Vegas (also called Encore at Wynn Las Vegas; often just called Encore) is a luxury resort, casino and hotel located on the Las Vegas Strip in Paradise, Nevada.
 The resort is connected to its sister resort, Wynn Las Vegas; both are owned by Wynn Resorts, headed by casino developer Steve Wynn.
The Cheek to Cheek Tour was a co-headlining tour by American singers Tony Bennett and Lady Gaga in support of their album, "Cheek to Cheek" (2014).
 The tour, which began with a two-night run at The Cosmopolitan in Las Vegas, played a total of 36 shows across Europe and North America during the first half of 2015.
 Many of the tour's shows were part of music festivals, such as the Ravinia Festival, the Copenhagen Jazz Festival, the North Sea Jazz Festival, and the Gent Jazz Festival.
 The Cheek to Cheek Tour grossed $15.3 million from 27 shows with a total attendance of 176,267.
Cheek to Cheek is a collaborative album by American singers Tony Bennett and Lady Gaga.
 It was released on September 19, 2014, by Interscope Records and Columbia Records.
 In 2011, Bennett and Gaga first met at the Robin Hood Foundation gala in New York City.
 After these two later recorded a rendition of "The Lady Is a Tramp", they began discussing plans for working on a jazz project.
 "Cheek to Cheek" consists of jazz standards by popular jazz composers such as George Gershwin, Cole Porter, Jerome Kern, and Irving Berlin.
 The album was inspired by Bennett and Gaga's desire to introduce the songs to a younger generation, since they believed that these tracks had universal appeal.
The Tropicana – Las Vegas Boulevard intersection on the Las Vegas Strip (Tropicana Avenue and Las Vegas Boulevard), is noteworthy for several reasons.
 It was the first intersection in Las Vegas completely closed to street level pedestrian traffic and its four corners are home to four major resorts: Excalibur Hotel and Casino, Tropicana Las Vegas, New York-New York Hotel and Casino and MGM Grand Las Vegas—the latter has 5,044 rooms and was once the largest hotel in the world.
 The resorts at the four corners have a total of 12,536 hotel rooms as of 2016.
The Future Now Tour was a co-headlining concert tour by American singers Demi Lovato and Nick Jonas.
 It is Lovato's fifth headlining tour, promoting her fifth studio album "Confident" (2015), and Jonas' third concert tour, promoting his third studio album "Last Year Was Complicated" (2016).
 The co-headlining tour started on June 29, 2016, in Atlanta, Georgia and ended on September 17, 2016, in Inglewood, California.
 Lovato continued the tour as a sole headlining act on September 24, 2016 in New York City, and the tour concluded in Monterrey on October 19, 2016.
Wynn Las Vegas, often simply referred to as Wynn, is a luxury resort and casino located on the Las Vegas Strip in Paradise, Nevada.
 The US$2.7-billion resort is named after casino developer Steve Wynn and is the flagship property of Wynn Resorts.
 The resort covers 215 acre .
 It is located at the northeast corner of Las Vegas Boulevard and Sands Avenue, directly across The Strip from the Fashion Show Mall.