Question: What is the nickname of city that the 1961 NCAA Division I Men's Ice Hockey Tournament took place in?

Context paragraphs:
Shillelagh Tournament: The Shillelagh Tournament is a Division I men's college ice hockey tournament hosted annually during the NCAA Division I men's ice hockey season by the Notre Dame Fighting Irish men's ice hockey program.  It was first held during the 2008–09 NCAA Division I men's ice hockey season as the successor to the Lightning College Hockey Classic.  After the Tampa Bay Lightning withdrew as tournament sponsor because of ownership changes, the Notre Dame Fighting Irish men's ice hockey program took control of the event, moving it to the Sears Centre in Hoffman Estates, Illinois.

2006 CCHA Men's Ice Hockey Tournament: The 2006 CCHA Men's Ice Hockey Tournament was the 35th CCHA Men's Ice Hockey Tournament.  It was played between March 3 and March 18, 2006.  Opening round and quarterfinal games were played at campus sites, while the semifinals, third place, and championship games were played at Joe Louis Arena in Detroit, Michigan.  By winning the tournament, Michigan State won the Mason Cup and received the Central Collegiate Hockey Association's automatic bid to the 2006 NCAA Division I Men's Ice Hockey Tournament.

2009 CCHA Men's Ice Hockey Tournament: The 2009 CCHA Men's Ice Hockey Tournament was the 38th CCHA Men's Ice Hockey Tournament.  It was played between March 6 and March 21, 2009 at campus locations and at Joe Louis Arena in Detroit, Michigan, United States.  Notre Dame won their second CCHA Men's Ice Hockey Tournament and Mason Cup and received the Central Collegiate Hockey Association's automatic bid to the 2009 NCAA Division I Men's Ice Hockey Tournament.

1961 NCAA Division I Men's Ice Hockey Tournament: The 1961 NCAA Men's Division I Ice Hockey Tournament was the culmination of the 1960–61 NCAA Division I men's ice hockey season, the 14th such tournament in NCAA history.  It was held between March 16 and 18, 1961, and concluded with Denver defeating St. Lawrence 12-2.  All games were played at the University of Denver Arena in Denver, Colorado.

2009 WCHA Men's Ice Hockey Tournament: The 2009 WCHA Men's Ice Hockey Tournament was an American college ice hockey tournament in 2009 played between March 13 and March 21, at five conference arenas and the Xcel Energy Center in St. Paul, Minnesota.  Minnesota-Duluth won their third WCHA Men's Ice Hockey Tournament and the Broadmoor Trophy and received the Western Collegiate Hockey Association's automatic bid to the 2009 NCAA Division I Men's Ice Hockey Tournament.

Denver: Denver ( ), officially the City and County of Denver, is the capital and most populous municipality of the U.S. state of Colorado.  Denver is in the South Platte River Valley on the western edge of the High Plains just east of the Front Range of the Rocky Mountains.  The Denver downtown district is immediately east of the confluence of Cherry Creek with the South Platte River, approximately 12 mi east of the foothills of the Rocky Mountains.  Denver is nicknamed the "Mile-High City" because its official elevation is exactly one mile (5280 ft ) above sea level, making it the highest major city in the United States.  The 105th meridian west of Greenwich, the longitudinal reference for the Mountain Time Zone, passes directly through Denver Union Station.

1960–61 NCAA Division I men's ice hockey season: The 1960–61 NCAA Division I men's ice hockey season began in November 1960 and concluded with the 1961 NCAA Division I Men's Ice Hockey Tournament's championship game on March 18, 1961 at the University of Denver Arena in Denver, Colorado.  This was the 14th season in which an NCAA ice hockey championship was held and is the 67th year overall where an NCAA school fielded a team.

2005 Atlantic Hockey Men's Ice Hockey Tournament: The 2005 AHA Men's Ice Hockey Tournament was the 2nd Atlantic Hockey Men's Ice Hockey Tournament.  It was played between March 9 and March 19, 2005.  Play-in and quarterfinal games were played at home team campus sites, while the semifinals and championship games were played at the Quinnipiac home venue: Northford Ice Pavilion in Northford, Connecticut.  By winning the tournament, Mercyhurst received the Atlantic Hockey Association's automatic bid to the 2005 NCAA Division I Men's Ice Hockey Tournament.

1961 WCHA Men's Ice Hockey Tournament: The 1961 WCHA Men's Ice Hockey Tournament was the 2nd conference playoff in league history.  The tournament was played between March 10 and March 11, 1961.  All games were played at home team campus sites.  By being declared as co-champions, both Minnesota and Denver were invited to participate in the 1961 NCAA Division I Men's Ice Hockey Tournament.

2008 CCHA Men's Ice Hockey Tournament: The 2008 CCHA Men's Ice Hockey Tournament was the 37th CCHA Men's Ice Hockey Tournament.  It was played between March 6 and March 22, 2008.  Opening round and quarterfinal games were played at campus sites, while the semifinals, third place, and championship games were played at Joe Louis Arena in Detroit, Michigan.  By winning the tournament, Michigan received the Central Collegiate Hockey Association's automatic bid to the 2008 NCAA Division I Men's Ice Hockey Tournament.

Supporting paragraphs: 1961 NCAA Division I Men's Ice Hockey Tournament Denver
Answer: Mile-High City