user: Question: What date did Dax Shepard play 20 questions?
Columns: ['Date', 'Cover model', 'Centerfold model', 'Interview subject', '20 Questions', 'Pictorials']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1 / 2 2012 Double Issue', 'Lindsay Lohan', 'Jan. Heather Knox and Feb. Leola Bell', 'Chris Wallace', 'Nick Offerman', 'Lindsay Lohan , Playmate Review']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "20 Questions" = 'Dax Shepard';