CREATE TABLE table_15110 ("Week" TEXT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Game site" TEXT, "Record" TEXT, "Attendance" TEXT)

Name the date for game site of riverfront stadium
SELECT "Date" FROM table_15110 WHERE "Game site" = 'riverfront stadium'
SELECT "Date" FROM "table_15110" WHERE "Game site" = 'riverfront stadium'