user: Question: What was the date of the game with an attendance of 20,874 fans?
Columns: ['Week', 'Date', 'Opponent', 'Score', 'Result', 'Attendance', 'Record']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Sat, June 28', 'vs. Edmonton Eskimos', '34–13', 'Win', '28,800', '1–0']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Attendance" = '20,874';