As of the 25th of September the Corona Toegangsbewijs (CTB) has been introduced in the Netherlands for attending events, visiting museums, theatres, restaurants, etc.
This system of checking has been implemented already in several countries.
More information, including how to get a so called QR code /proof of vaccination if you have been vaccinated outside the EU, can be found via:
With the CTB and proof of identity (passport, driving license, id card).
Everyone of 13 years or older needs to present the CTB and everyone older then a14 need to present also proof of identity.