As per the official Netherlands government website: "From 23 March 2022 people travelling to the Netherlands from outside the EU/Schengen area no longer need to show a negative test result."
When returning to your home country from the Netherlands, the organizer suggests contacting the official government website of your jurisdiction to ensure you understand the requirements.
For example, US individuals must get a negative covid test within 24 hours of leaving the Netherlands.
Such tests can be found around the Amsterdam city center, and they are completely free. If you are traveling in from the United States, the organizer suggests scheduling time on the last day of your stay to finish your test.
Travel inside the EU and other non-US nations may have different re-entry regulations, so please double check with your government's website.