Correction, I can only watch it online. And maybe not even that as I am Swedish and not a Danish citizen.
We have something similar in Kungliga Biblioteket, but they don't have this movie.
>Materialet kan desværre ikke bestilles
>Der kan dog være andre muligheder for at få adgang til materialet.
Adgang til streaming for brugere tilknyttet skoler og biblioteker med abonnement på Fortælletid
It's part of the Culture Ministry's Canon for 2006, so it's widely available at Danish libraries. The publisher probably also has digital copies.
https://bibliotek.dk/linkme.php?rec.id=870970-basis%3A476191...
You can also watch it online, if you have a library login:
https://fjernleje.filmstriben.dk/film/2605375700/festen