CREATE TABLE table_27247 ("Week" FLOAT, "Date" TEXT, "Kickoff" TEXT, "Opponent" TEXT, "Final score" TEXT, "Team record" TEXT, "Game site" TEXT, "Attendance" FLOAT)

What is the date of the game at Olympic Stadium?
SELECT "Date" FROM table_27247 WHERE "Game site" = 'Olympic Stadium'
SELECT "Date" FROM "table_27247" WHERE "Game site" = 'Olympic Stadium'