Question: When was the home arena of the Louisville Blades added to the National Register of Historic Places?

Context paragraphs:
AF and AM Lodge 687: The Ancient Free and Accepted Masons Lodge 687 (AF and AM), also known as the Independent Order of Odd Fellows J.R. Scruggs Lodge 372, is a building constructed in 1876 as a Masonic Hall.  It is located in downtown Orangeville, Illinois, a small village in Stephenson County.  The building, originally built by the local Masonic Lodge, was bought by the locally more numerous Independent Order of Oddfellows fraternal organization in 1893.  The building has served all of Orangeville's fraternal organizations for more than 125 years, from the time it was built.  The two-story, front gabled building has Italianate architecture elements.  It had a rear wing added to it in 1903.  By 2003, the first floor has been returned to use as a community center, holding dinner theatre and other community functions, much as the building had originally served the community until first floor space was rented out for commercial use in the late 19th century.  The building was listed on the U.S. National Register of Historic Places in 2003.  The building is the home of the Mighty Richmond Players Dinner Theatre (MRPDT) dinner theatre which seats 54 persons and has scheduled four different productions for the 2010 season.  A $150,000 renovation of the building was recently completed.  The building was listed on the National Register of Historic Places as AF and AM Lodge 687, Orangeville in 2003.

Lewis and Lucretia Taylor House: The Taylor House is a historic home in Tallahassee, Florida.  The home was added to the U.S. National Register of Historic Places on April 6, 2015.  The Taylor House Museum, located at 442 West Georgia Street, was also added to the Tallahassee-Leon County Register of Historic Places on October 26, 2011.  On July 27, 2012, the Florida Department of State designated the home a Florida Heritage Site.

El Jardin: El Jardin is a house located at 3747 Main Highway in Miami, Florida.  It is listed on the U.S. National Register of Historic Places.  El Jardin is now home to Carrollton School of the Sacred Heart in Miami, Florida.  It was added to the U.S. National Register of Historic Places on August 30, 1974.

Blades House: The Blades House, also known as the W.B. Blades House, is an historic house located at 602 Middle Street, in New Bern, North Carolina, in the United States.  Built in 1907 for lumber magnate William B. Blades, it was designed in the Queen Anne style by prolific local architect Herbert Woodley Simpson.  On January 14, 1972, it was added to the National Register of Historic Places.

Portland Packing Company Factory: The Portland Packing Company Factory is an historic factory building at 14-26 York Street in Portland, Maine.  It was added to the National Register of Historic Places in 1996.  Built in 1884, it was home to Maine's oldest and largest vegetable canning company until 1927.  After years of neglect, it was rehabilitated in 1995-6.  It was listed on the National Register of Historic Places in 1996.

Louisville Blades: The Louisville Blades were a minor league professional ice hockey team that played in the International Hockey League during the 1948–49 season, and the United States Hockey League during the 1949–50 season.  The Blades were based in Louisville, Kentucky and played at the Louisville Gardens.

Redcliffe Plantation State Historic Site: Redcliffe Plantation State Historic Site is a state park in South Carolina, United States.  Redcliffe Plantation, also known as Redcliffe, completed in 1859, is a Greek Revival plantation house located on the site that is listed on the National Register of Historic Places.  The house was designed by the baron Louis Berckmans and was built in 1857.  It was built for James Henry Hammond and was home to three generations of his descendants.  His great-grandson John Shaw Billings, editor of "Time", "Life", and "Fortune" magazines, donated the estate and collections to the people of South Carolina in 1973.  The same year it was added to the National Register of Historic Places.

Louisville Gardens: Louisville Gardens is a multi-purpose, 6,000-seat arena, in Louisville, Kentucky, that opened in 1905, as the Jefferson County Armory.  It celebrated its 100th anniversary as former city mayor Jerry Abramson's official "Family-Friendly New Years Eve" celebration location.  It was added to the National Register of Historic Places in 1980.

Historic Firehouses of Louisville: The Historic Firehouses of Louisville is a Thematic Resource (TR) Multiple Property Submission (MPS) on the National Register of Historic Places.  The submission represents 18 historic fire stations, located in Louisville, Kentucky, which were added to the National Register in 1980–81 due to their historical and architectural merits.

Deal-Mendenhall Hall: Deal-Mendenhall Hall is a historic home in Springville, Utah, United States.  The house was listed on the U.S. National Register of Historic Places (NRHP) on January 5, 1998.  It was part of the Springville Multiple Property Submission which added eleven Springville properties to National Register of Historic Places.

Supporting paragraphs: Louisville Blades Louisville Gardens
Answer: 1980