user: Question: When was the venue Mexico City, Mexico with a goal of 8?
Columns: ['Goal', 'Date', 'Venue', 'Score', 'Result', 'Competition']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'March 19, 1960', 'San José , Costa Rica', '3–0', 'Win', '1960 Panamerican Cup']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Venue" = 'Mexico City, Mexico' AND "Goal" = 8.0;