June 24th, Den Helder. SAIL Den Helder is, with the backdrop of the international Tall Ships the biggest 2017 public event in the Netherlands. A magnificent nautical event in the northern part of North Holland.The first time Sail Den Helder took place was in July 1993. It coincided with the 36th Navy Day, called in those days The National Fleet Days. From 22 June up to and including 25 June 2017, Sail Den Helder will be organised for the fifth time.