On 26 June the Netherlands will be taking the fourth step in the reopening plan and everything will reopen.
You must still maintain a distance of 1.5 metres apart. However in places where this is not possible, such as in nightclubs and at organised events, you will need a coronavirus entry pass (visit coronacheck.nl for more info).
In addition, the requirement to wear a face mask will no longer apply in most situations. It will continue to apply only in situations where staying 1.5 apart is impossible. For example on public transport, on aeroplanes and other forms of passenger transport, at stations and airports, and in secondary schools.
See all the regulations at this link in English