user: Question: When was the Metallica: Escape from the Studio show?
Columns: ['Year', 'Date', 'Event', 'Days', 'Stages', 'Acts']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1990.0, '18 August', 'Monsters of Rock', '1 day', '1 stage', '5 bands']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Event" = 'Metallica: Escape from the Studio';