user: Question: What tournament was on May 31, 1987?
Columns: ['Date', 'Tournament', 'Winning score', 'Margin of victory', 'Runner(s)-up']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Feb 21, 1987', 'Tsumura Hawaiian Ladies Open', '–9 (69-71-67=207)', '2 strokes', 'Jane Geddes']
SQL:

assistant: SELECT "Tournament" FROM "Table" WHERE "Date" = 'May 31, 1987';