Several hotels are available nearby the workshop venue at OsloMet.
Our suggestions:

• SCANDIC ST. OLAVS PLASS, St. Olavs plass 1 (https://www.scandichotels.no/hotell/norge/oslo/scandic-stolavsplass)
• SCANDIC HOLBERG, Holbergs plass 1 (https://www.scandichotels.no/hotell/norge/oslo/scandic-holberg)
• Radisson Blu Scandinavia Hotel, Holbergsgate 30 (https://www.radissonhotels.com/no-no/hoteller/radisson-blu-oslo-scandinavia)