user: Question: Who is every vacator if date of successors formal installation is August 8, 1960?
Columns: ['State (class)', 'Vacator', 'Reason for change', 'Successor', 'Date of successors formal installation']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Hawaii (1)', 'New seats', 'Hawaii achieved statehood August 21, 1959.', 'Hiram Fong (R)', 'August 21, 1959']
SQL:

assistant: SELECT "Vacator" FROM "Table" WHERE "Date of successors formal installation" = 'August 8, 1960';