This ball was supposed to be an event where the high nobility and royals would try to understand the demon lord while also trying to introduce their descendants to him.
The demon lord is the highest authority in the demon empire, so each and every noble would try to get into his good books, which included the low nobility.
For the low-ranked nobles, such as barons and viscounts, this was just an event for celebration, as they were way too low-ranked to get in contact with the demon lord. But the ones who were wiser did tell their daughters and granddaughters to try to appeal to the demon lord.
It was nothing new, though.
Even if there was no demon lord, the heirs of low-ranking demons would always try to get a hold of some high-ranking noble heir's thigh.
And it was not just the demon empire; this was something that happened in almost every empire and kingdom.
It was just how the world worked.