user: Question: What venue was round 20 held at?
Columns: ['Round', 'Opposition Team', 'Venue', 'Result', 'Report']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Melbourne Demons', 'MCG', 'Win 23.16 (154) - 6.14 (50) .', 'Report']
SQL:

assistant: SELECT "Venue" FROM "Table" WHERE "Round" = 20.0;