CREATE TABLE table_24309 ("Competition" TEXT, "Round" TEXT, "Opponent" TEXT, "Result" TEXT, "Score" TEXT, "Home/Away" TEXT, "Venue" TEXT, "Attendance" TEXT, "Date" TEXT)

Who is the opponent when the attendance is n/a?
SELECT "Opponent" FROM table_24309 WHERE "Attendance" = 'N/A'
SELECT "Opponent" FROM "table_24309" WHERE "Attendance" = 'N/A'