user: Question: When does V Madgwick Cup take place?
Columns: ['Race Name', 'Circuit', 'Date', 'Winning driver', 'Constructor', 'Report']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['XI Grande Prêmio Cidade do Rio de Janeiro', 'Gávea', '20 January', 'José Froilán González', 'Ferrari', 'Report']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Race Name" = 'V Madgwick Cup';