user: Question: What date did the Boston Celtics play at Richfield Coliseum?
Columns: ['Game', 'Date', 'Opponent', 'Score', 'Location', 'Record']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [15.0, 'Sat. Dec. 1', '@ Cleveland Cavaliers', '110-104', 'Richfield Coliseum', '14-1']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Location" = 'Richfield Coliseum';