The Sumida Hokusai Museum is almost entirely a display of replicas. They are very upfront about being a “learning” museum - they do hold the original prints but display them in rotation. We were there last year and there was exactly one original print on display (in a back corner of the special exhibit room); it was one of the “36 views” but not one of the uber-famous ones.
While most the time they display replica, sometimes they do show the original, like for example right now.
Sadly no live sumo in Ryogoku, the next tournament starts this Sunday in Nagoya.