Question: Which American dancer worked at a jazz music bar and lounge in Atlantic City, New Jersey prior to its closing in the mid-1970's?

Context paragraphs:
Lucerna Music Bar: Lucerna Music Bar is a concert club housed within the Lucerna Palace, located on a hallway or "passage" that connects Vodičkova and Štěpánská streets near historic Wenceslas Square, in the New Town (Nové mesto) area of Prague in the Czech Republic.  The name Lucerna means "lantern" in Czech.  Lucerna Palace is an Art Nouveau building built by former President Václav Havel's family.  The Lucerna Music Bar is one of the venues within Lucerna Palace involved in the Prague International Jazz Festival and the AghaRTA Prague Jazz Festival.  It was used for the Václav Havel Tribute Concert, held in Václav Havel's honor, upon his death in 2011.  The Lucerna Music Bar is similar in size to Washington, DC's , Cleveland's Agora Theatre and Ballroom, Philadelphia's Trocadero Theatre, or Baltimore's Rams Head Live! , however the selection of artists is more international.  The Lucera Music Bar has played a role in giving exposure to many bands from the Czech Republic and around the world.

Grace's Little Belmont: Grace's Little Belmont was a jazz music bar and lounge in Atlantic City, New Jersey.  Located at 37 Kentucky Avenue, it was one of the four popular black nightclubs situated on that street between the mid-1930s and mid-1970s; the others were Club Harlem, the Paradise Club, and the Wonder Gardens.  The Little Belmont was located across the street from Club Harlem, with which it often shared performers and patrons.  Wild Bill Davis and his swing and jazz quartet were featured summer performers from 1950 through the mid-1960s, and Elvera M. "Baby" Sanchez, mother of Sammy Davis, Jr., worked at the bar.  The club closed in the mid-1970s and was later demolished.

Thunder over the Boardwalk: Thunder Over the Boardwalk (also known as the Atlantic City Airshow) is an annual airshow held over the Atlantic City boardwalk every summer.  Since 2003, it has set the bar for beachfront airshows across the United States and is currently one of the largest airshows in North America.  What sets it apart, aside from being a beach show, is the fact that it usually occurs on a Wednesday.  It takes place along the beaches of Atlantic City, New Jersey, in front of the world-famous boardwalk, with the casinos in the background.  Flybys and demonstrations as high as 15000 ft and as low as 50 ft over the water in front of the Atlantic City skyline.

WPGG: WPGG (1450 AM; "WPG Talk Radio 104.1") is an American radio station licensed to serve the community of Atlantic City, New Jersey.  The station is owned by Townsquare Media and the broadcast license is held by Townsquare Media Atlantic City License, LLC.  Operating with non-directional 1,000 watts day and night, the station can be heard throughout New Jersey's Ocean, Atlantic, and Cape May Counties and into southern Delaware, coastal Maryland, coastal North Carolina, the southern side of much of Long Island, NY, and southern parts of Cape Cod, MA.  Since October 22, 2012, the station broadcasts a talk radio format under the branding "WPG Talk Radio 1450."  In May 2016, reflecting the frequency of its FM translator, 104.1 W281BH, the station rebranded as "WPG Talk Radio 104.1."  WPGG's transmitter is located in Atlantic City, while its studios are in, and translator transmits from, Northfield, New Jersey.

WAJM: WAJM, assigned to 88.9 FM and licensed to Atlantic City, New Jersey, is a high school radio station owned by the Atlantic City Board of Education and is operated by the students of Atlantic City High School.  Currently, WAJM broadcasts live Monday thru Friday from 7:00am to 3:30pm and during after hours, on weekends, holidays and when Atlantic City High School is closed due to inclement weather the station operates on an automated system where music, station IDs and PSA are shuffled and broadcast on-air.  Starting at its inception WAJM had been broadcasting with a jazz radio format until 2009 when it flipped to a freeform radio format using the moniker 88.9 The Jam.  The studios, offices and transmitter are located on the campus of Atlantic City High School on North Albany Avenue in Atlantic City.  In 2009 WAJM began simulcasting its live and automated broadcasts via the Internet in both an audio only feed and audio/video feed.  The station was a creation of Mr.Norman Draper.  The first school year of on air broadcasting was 1996-97.  That year the students interviewed "Sugar" Ray Leonard, and did a live simulcast from the grand opening of the new Atlantic City Convention Center.

U.S. Route 322 in New Jersey: U.S. Route 322 (US 322) is a U.S. highway running from Cleveland, Ohio east to Atlantic City, New Jersey.  The easternmost segment of the route in New Jersey runs 62.64 mi from the Commodore Barry Bridge over the Delaware River in Logan Township, Gloucester County, where it continues southeast to Atlantic Avenue and Pacific Avenue in Atlantic City, Atlantic County.  The portion of the route between the Commodore Barry Bridge and Route 42 is mostly a two-lane undivided road that is concurrently signed with County Route 536, passing through Mullica Hill and Glassboro.  From Williamstown, US 322 follows the Black Horse Pike, a four-lane road, southeast to Atlantic City.  In Hamilton Township, Atlantic County, US 322 forms a concurrency with U.S. Route 40, continuing with that route all the way to Atlantic City.  US 322 intersects several major roads including U.S. Route 130 and Interstate 295 in Logan Township, the New Jersey Turnpike in Woolwich Township, Route 55 in Harrison Township, Route 42 in Williamstown, Route 50 and U.S. Route 40 in Hamilton Township, the Garden State Parkway in Egg Harbor Township, and U.S. Route 9 in Pleasantville.

Atlantic City Line: The Atlantic City Line (ACL) is a rail line operated by New Jersey Transit (NJT) in the United States between Philadelphia, Pennsylvania and Atlantic City, New Jersey, operating along the corridor of the White Horse Pike.  It runs over trackage that was controlled by both the Pennsylvania Railroad (PRR) and the Pennsylvania-Reading Seashore Lines.  It shares trackage with SEPTA and Amtrak on the Northeast Corridor (NEC) until it crosses the Delaware River on its own Delair Bridge into New Jersey.  The Atlantic City Line also shares the right-of-way with the PATCO Speedline between Haddonfield and Lindenwold, New Jersey.  There are 14 departures each day in each direction.  Conrail also uses short sections of the line for freight movements (which are segregated), including the NEC-Delair Bridge section to its main freight yard in Camden, New Jersey.  Unlike all other NJT railway lines, the Atlantic City line does not have traditional rush hour service.  The Atlantic City line is colored dark blue on New Jersey Transit's system maps, and the line's symbol is a lighthouse.

Elvera Sanchez: Elvera Sanchez (September 1, 1905 – September 2, 2000) was an American dancer and the mother of Sammy Davis Jr.

Atlantic City Bus Terminal: The Atlantic City Bus Terminal is a regional bus station and a major stop for New Jersey Transit buses in Atlantic City, New Jersey.  Located at the 1900 block of Atlantic Avenue, the station is now only half its original size, as part of it was carved out for a Polo Ralph Lauren store along the Atlantic City Outlets The Walk.  The terminal contains vending machines, restrooms, a seating area, and ticket offices for New Jersey Transit and Greyhound bus lines.  The Atlantic City Convention Center and Rail Terminal is located three blocks away.

Atlantic City Rail Terminal: The Atlantic City Rail Terminal is Atlantic City, New Jersey's train station.  It is the easternmost stop on the Atlantic City Line to and from Philadelphia.  The station was also served by the Atlantic City Express Service (ACES) from 2009 until it was formally discontinued on March 9, 2012.  The Atlantic City terminal is a 5-track, 3-platform terminal located inside of the Atlantic City Convention Center.  The Atlantic City Line is a commuter train and runs daily all day.

Supporting paragraphs: Grace's Little Belmont Elvera Sanchez
Answer: Elvera Sanchez