Hackeriet is: closed
This page lets you ring the doorbell when Hackeriet is gathering.
Your presence will also be announced on IRC #oslohackerspace
Doorbell works again as of December 2017, but open/closed state is not correctly reported.
If there's no response try nagging on IRC (alternatively through Matrix with riot.im).
If you're a member (or a 1337 h4ck3r) you can open the door with the door remote