user: Question: Name the date for game site of Riverfront Stadium
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Game site', 'Record', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'September 12, 1982', 'Cleveland Browns', 'L 7-21', 'Kingdome', '0-1', '55,907']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Game site" = 'Riverfront Stadium';