Question: Mitch Margo and the Tokens played which Las Vegas casino demolished in 2015?

Context paragraphs:
Riviera (hotel and casino): Riviera (colloquially, "the Riv") was a hotel and casino on the Las Vegas Strip in Winchester, Nevada, which operated from April 1955 to May 2015.  It was last owned by the Las Vegas Convention and Visitors Authority, which decided to demolish it to make way for the Las Vegas Global Business District.

Mitch Margo: Mitch Margo (born May 25, 1947) is an American singer and songwriter who was a professional recording artist by the age of 14.  Along with brother Phil Margo), he was, and still is, a member of The Tokens.  The vocal group is best known for its hit recording of "The Lion Sleeps Tonight", which rose to #1 on the "Billboard" Hot 100 and remained there for 3 weeks in 1961.  Other hits by The Tokens include: "Tonight I Fell In Love" (which Mitch Margo co-wrote), "I hear Trumpets Blow" (written by Mitch Margo), "He’s In Town", and "Portrait of My Love".  The Tokens are still recording and performing.  Their schedule includes venues such as The Riviera in Las Vegas, Epcot in Walt Disney World, Orlando, Florida, and much more.

The D Las Vegas: The D Las Vegas Casino Hotel is a 34-story, 638-room hotel and casino in Downtown Las Vegas Nevada, owned and operated by Derek and Greg Stevens.

Tropicana – Las Vegas Boulevard intersection: 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.

Madame Tussauds Las Vegas: Madame Tussauds Las Vegas is a wax museum located in the Las Vegas Strip at The Venetian Las Vegas casino resort in Paradise, Nevada.  The attraction opened in 1999, becoming the first Madame Tussauds venue to open in the United States.  It features over 100 wax figures of famous celebrities, film and TV characters, athletes, musicians and Marvel superheroes, as well a 4D movie theatre.  Subsequent Madame Tussauds venues opened in the U.S in New York City in 2000, Washington D.C. in 2007, and Hollywood, California in 2009.

Fabrizio Boccardi: Fabrizio Boccardi is an Italian American entrepreneur, investor, and producer.  Boccardi is the owner and creator of the multimedia brand the Tyrant.  In addition, he controls several investments,including Media, technology, and Gaming in the United States and abroad.  Boccardi has attempted to buy control of a Las Vegas casino, most notably Riviera Holdings, former owner of the Riviera Hotel & Casino on the strip of Las Vegas, and Riviera Casino in Black Hawk Colorado.

Cross Country (band): Cross Country is a band from Brooklyn, New York, formed in 1973 by three-fourths of the musical group, The Tokens - Jay Siegel, Mitch Margo and Phil Margo.

Holy Cow Casino and Brewery: Holy Cow!  Casino and Brewery (formerly Foxy's Firehouse) was a locals casino and microbrewery on South Las Vegas Boulevard, north of the Las Vegas Strip, in Las Vegas, Nevada.  The property began in 1955 as Foxy's Deli, which operated until its closure in 1975.  A year later, the building was reopened as a casino named Foxy's Firehouse, which later closed in 1988.  Tom "Big Dog" Wiesner purchased the building and reopened it as the Holy Cow casino in 1992.  Wiesner added a microbrewery the following year, making the Holy Cow the first brewery to open in Las Vegas.  Wiesner persuaded the state to change its laws that had prohibited breweries from operating in Las Vegas.

Philip Margo: Philip "Phil" Margo (born April 1, 1942, Brooklyn, New York) is an American musician and author who, along with his brother Mitch Margo is a member of The Tokens.  They are best known for their hit recording of "The Lion Sleeps Tonight" which rose to #1 on the "Billboard" Hot 100 and remained there for three weeks in 1961.  Other hits by The Tokens included "Tonight I Fell In Love", "I Hear Trumpets Blow", "He's In Town" and "Portrait of My Love".  The Tokens are still recording and performing.  Their schedule includes venues such as The Riviera in Las Vegas, Nevada and Epcot (Walt Disney World, Orlando, Florida).

Frank Rosenthal: Frank Lawrence "Lefty" Rosenthal (June 12, 1929 – October 13, 2008) was a professional sports better, former Las Vegas casino executive, and organized crime associate.  Martin Scorsese's film "Casino" (1995) is based on his career in Las Vegas.

Supporting paragraphs: Mitch Margo Riviera (hotel and casino)
Answer: Riviera