CREATE TABLE table_46643 ("Date" TEXT, "Opponent#" TEXT, "Rank #" TEXT, "Site" TEXT, "Result" TEXT, "Attendance" TEXT)

What date was the game when 40,000 attended?
SELECT "Date" FROM table_46643 WHERE "Attendance" = '40,000'
SELECT "Date" FROM "table_46643" WHERE "Attendance" = '40,000'