What's On Experience events, activities and museum highlights! What's On: March Closed Mondays Closed Mondays From January through March 2023 the museum is closed on Mondays. Open Monday 20 February (winter holiday Oslo). 1. Jan – 31. Mar 2023 March - 2023 April Monday Tuesday Wednesday Thursday Friday Saturday Sunday 27. Closed Mondays 28. 01. 02. 03. 04. 05. 06. Closed Mondays 07. 08. 09. 10. 11. 12. 13. Closed Mondays 14. 15. 16. 17. 18. 19. 20. Closed Mondays 21. 22. 23. 24. 25. 26. 27. Closed Mondays 28. 29. 30. 31. 01. 02.