CREATE TABLE table_2770 ("Episode" TEXT, "Location" TEXT, "Headliner" TEXT, "Comedians" TEXT, "Airdate" TEXT)

What date did the show air when Rhod Gilbert was the headliner?
SELECT "Airdate" FROM table_2770 WHERE "Headliner" = 'Rhod Gilbert'
SELECT "Airdate" FROM "table_2770" WHERE "Headliner" = 'Rhod Gilbert'