A good ceremony is under construction for a long time. You can't just make up a new ceremony on the spot. A ceremony is done a certain way because that's the way it's always been done. In short, to build a ceremony, you have to create a ritual first. Then, the ritual can be constructed into a bigger, more lavish ceremony.

This kanji also means equation for some reason. Just think of a ceremony that involves doing math and solving equations. How strange would that be? Pretend you're at this ceremony.

So, you're at a ritual, but not just any old ritual. This is a full-blown ceremony and it's incredibly chic (しき). Imagine just how chic it is. Give it a shot — I'll let you come up with the chicness this time (it's good practice).