Monday 10 April, Easter Monday, the gym opens at 9h already and closes at the regular closing time of 23.30h (bouldering until 22.30h). Same goes for Monday 29 May, Whit Monday.
Normal opening hours apply for Good Friday (7 April) and Bevrijdingsdag (5 May). However, Koningsdag (27 April) the gym will be closed.
Happy holidays!