This is such a fun question!

Cetus would definitely be curious about it and want to go wandering around while Rhodes is docked at the Grand Knight Territory - he actually knows next to nothing about Kazimierz and given that its a city of indulgence and appeal through commercialization, he's at least intrigued enough to go wandering about and get a sense of what it's like while they're there.

He's really curious about the major since it's such a cultural milestone for Kazimierz. He knows little of knights and the traditions that Kazimierz was built upon, has no frame of reference by which to see why some consider it a slandering of honor, he's kind of just there to enjoy the spectacle. He probably drags Deepcolor along to help expose her to more of the world and gather a better frame of reference for herself in the future, to better sell her cover story that she's a well-educated, well-traveled young Columbian lady. They have fun with it, but Deepcolor buys into the commercialism a bit easily. Even though he hates excessive spending, Cetus relents and lets her buy some stuff to mark the occasion. As a treat.