CREATE TABLE table_2773 ("Episode" TEXT, "Location" TEXT, "Headliner" TEXT, "Comedians" TEXT, "Airdate" TEXT)

What episode took place in Belfast Waterfront Hall?
SELECT "Episode" FROM table_2773 WHERE "Location" = 'Belfast Waterfront Hall'
SELECT "Episode" FROM "table_2773" WHERE "Location" = 'Belfast Waterfront Hall'