user: Question: What date was the Silverstone circuit driven? 
Columns: ['Race Name', 'Circuit', 'Date', 'Winning driver', 'Constructor', 'Report']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['XI Pau Grand Prix', 'Pau', '10 April', 'Juan Manuel Fangio', 'Maserati', 'Report']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Circuit" = 'Silverstone';