user: Question: What is Event, when Date is April 20, 2013?
Columns: ['Event', 'Date', 'Rating', 'Share', 'Viewers']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Event', 'Date', 'Rating', 'Share', 'Viewers']
SQL:

assistant: SELECT "Event" FROM "Table" WHERE "Date" = 'April 20, 2013';