Question: The AXIS is a mid-sized auditorium located at a hotel and casino operated by who?
Context: Backstreet Boys: Larger Than Life is the first residency show by American vocal group Backstreet Boys, performed at The AXIS auditorium located in the Planet Hollywood Resort & Casino in Las Vegas, Nevada.  The show had its opening night on March 1, 2017 and is currently scheduled to run through February 17, 2018. Jennifer Lopez: All I Have is the first residency show by American entertainer Jennifer Lopez.  Performed at The AXIS auditorium located in the Planet Hollywood Resort & Casino in Las Vegas, Nevada, the residency show began on January 20, 2016. Merrill Auditorium is a 1,900-seat auditorium located in Portland, Maine, United States.  Originally known as Portland City Hall Auditorium, it is located in the eastern section of Portland City Hall.  Organizations such as Portland Ovations and the Portland Symphony Orchestra use the auditorium as a primary performance space.  PortTIX is the official box office of the Merrill Auditorium. Mahajati Sadan is an auditorium located in Chittaranjan Avenue, Kolkata, West Bengal, India.  This auditorium is regularly used for Bengali theatres. Seminars are also organized in the seminal hall of Mahajati Sadan.  This auditorium was an important part of India's freedom movement.  Rabindranath Tagore called this auditorium "House of the Nation". The AXIS (known as The AXIS powered by Monster for sponsorship purposes, also referred to as the AXIS Theater) is a mid-sized auditorium located at Planet Hollywood Las Vegas on the Las Vegas Strip.  The venue hosts a variety of events from charity benefits, concerts and award shows.  It is used frequently for the beauty pageants : Miss Universe, Miss America and Miss USA.  Since 2007, the auditorium has been the home to Justin Timberlake's annual concert to benefit the Shriners Hospitals for Children.  In 2011, it was voted as one of the "Best Concert Halls & Theaters In Las Vegas".  It is the largest theatre of its kind in the United States. Planet Hollywood Las Vegas (formerly Tally-Ho, King's Crown and Aladdin) is a hotel and casino located on the Las Vegas Strip in Paradise, Nevada.  It is owned and operated by Caesars Entertainment Corporation. Britney: Piece of Me is the first residency show by American singer Britney Spears, performed at The AXIS auditorium located in the Planet Hollywood Resort & Casino in Las Vegas, Nevada.  The show had its opening night on December 27, 2013.  In 2015, Spears extended her contract with Planet Hollywood through 2017. The SF Masonic Auditorium (originally the Grand Masonic Auditorium and formerly known as the Nob Hill Masonic Auditorium) is an auditorium located atop Nob Hill in San Francisco, California.  Opening in 1958, it is the main meeting venue within the California Masonic Memorial Temple.  It has several large sculptures representing the four branches of the Armed Services on its outside wall.  There is a frieze representing a gigantic tug of war between good and evil forces.  Inside, it has a unique mosaic window designed by artist Emile Norman.  The mosaic depicts a variety of natural themes as well as the professions.  It contains gravel and soil from each of the 58 counties in California. The Albany Municipal Auditorium is a multi-purpose auditorium located in downtown Albany, Georgia, U.S.  The 965-seat, classic style auditorium includes an orchestra level, as well as first and second balconies and it was listed as "Municipal Auditorium" on the National Register of Historic Places by the United States Department of the Interior in 1975.  The auditorium is part of a sports, entertainment and convention complex that also includes the Albany Civic Center and the Veterans Park Amphitheater. Sisir Mancha is an auditorium located in A.J.C. Bose Road, Kolkata, West Bengal, India.  This auditorium is regularly used for Bengali theatres.  The auditorium is adjacent to Rabindra Sadan and Nandan Complex.  The theatre auditorium is named after Bengali dramatist Sisir Kumar Bhaduri and it was established in 1978.
Answer: Caesars Entertainment Corporation