Vampires celebrates birthdays like human do but they gave importance to the coming of age ceremony which was the 100th birthday of a vampires.
The third princess just turned 100-years-old and this calls for a huge celebration. The ball room was decorated with so many red roses and the red carpet that starts from the winding staircase extended all the way to the main entrance of the room. Drinks and foods were all prepared for the guests and of course, they have plenty of blood to serve.
Blood, by all means, should be served fresh. Therefore, the royal vampires have prepared humans who serve their family for generations - who will also serve as their livestocks.
Guests can take blood from them directly and they won't complaint. Sometimes, this could lead to blood loss or death but no one will say anything about it.