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Most bridges and locks work Sunday hours on holidays (feestdagen, abbreviated as fd) and it is useful to be aware of these dates to avoid unexpected blockages. It is also a time when most towns organise special events and festivals so it is nice to plan to make the most of these festivities by arriving in the right place at the right time.

   2014  2015  2016
Easter (Pasen)   20 & 21 April  5 & 6 April  27 & 28 March
Queen's Day (Koninginnedag)  26 April  27 April  27 April
Liberation Day (Bevrijdingsdag)     5 May   
Ascension Day (Hemelvaart)  29 May  14 May 5 May

Whit Weekend (Pinksteren)
(50 days after Easter)

Sun 8 June, Mon 9 June  Sun 24 May, Mon 25 May  Sun 15 May,    Mon 16 JMay   
Gronings Ontzet (Groningen's Relief)
No bridge service - applies in Groningen only
 28 August
Pekela Annual Market
No bridge service - applies to Pekel Aa & Pekela Hoofddiep only (2nd Saturday in September)
 13 Sept  12 Sept  10 Sept