From the other place:

You can now register for the workshops being organised during the National Open Science Festival 2026!

During the festival, there will be five rounds of 45-minute workshops. If you have registered for the festival, you can now select your workshops via the registration platform, using your existing profile.

Please be aware that space is limited and workshops will fill up on a first-come, first-served basis.

Register here: https://opensciencefestival.nl/news/registration-for-workshops-is-now-open