CREATE TABLE table_50896 ("Race Title" TEXT, "Circuit" TEXT, "City / State" TEXT, "Date" TEXT, "Winner" TEXT, "Team" TEXT)

Which city or state contains Calder Park Raceway?
SELECT "City / State" FROM table_50896 WHERE "Circuit" = 'calder park raceway'
SELECT "City / State" FROM "table_50896" WHERE "Circuit" = 'calder park raceway'