CREATE TABLE table_20441 ("No" TEXT, "Season" TEXT, "Start date  ( 1st night ) " TEXT, "End date  ( Last night ) " TEXT, "Location" TEXT, "No of Proms" TEXT)

When are start dates (1st night) for the season of 1966?
SELECT "Start date (1st night)" FROM table_20441 WHERE "Season" = '1966'
SELECT "Start date (1st night)" FROM "table_20441" WHERE "Season" = '1966'