The sense of ritual, superstition, and many others were still very strong at this point of time. They would have to pay close attention to the date, Feng Shui, and so on when they were about to hold any kind of ceremony.
This naturally included the inauguration.
The process couldn't be stopped midway because it would then deemed as fail and they would have to pick another date to do the inauguration in the future. Emperor Yang Zhou had waited for so many years for this day.
Because only when he truly finished the inauguration would he be able to hold the complete power of the court. Even if he had become more powerful, but the other officials would only fully recognize him when he finished this ceremony.
No one is allowed to make trouble on this day.