เหตุการณ์ใดเกิดขึ้นใน Belfast Waterfront Hall?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
What episode took place in Belfast Waterfront Hall?It is not neccessary to use all the tables.
 table_23122988_1:  (episode [ VARCHAR ] location [ VARCHAR) ]
SELECT episode FROM table_23122988_1 WHERE location = "Belfast Waterfront Hall"