user: Question: What was the date of the game held at Invesco Field?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Game site', 'NFL Recap', 'Record', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'September 11, 2005', 'Chicago Bears', 'W 9-7', 'FedEx Field', 'Recap', '1-0', '90,138']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Game site" = 'Invesco Field';