The conference will be held in Hotel Scandic Helsfyr. The booking code for the hotel rooms is BUIO251022. The agreed price is 1400NOK per night, valid until October 10 (extended).
A direct link to reserve a single room from Oct 24 to Oct 26 using the code.
Information on Oslo
Some information about things to do in Oslo: https://www.visitoslo.com/en/