user: Question: What is the date of the event with a $322,280 prize?
Columns: ['Date', 'City', 'Event', 'Winner', 'Prize']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['November 19–22, 2009', 'Playa Conchal', 'LAPT Playa Conchal - Costa Rica', 'Amer Sulaiman', '$172,095']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Prize" = '$322,280';