No shoes, every 12 years

Larten knew a bit about the Council. It was held every twelve years in
Vampire Mountain, and vampires from all over the world made their way to
it. Laws were passed there, tournaments were held, and friendships were
forged or renewed.

***

Finally Seba stirred. “Did you notice Paris’s bare feet?” he asked.
It was an odd question, but Larten was accustomed to strange queries.

“Yes. I assumed that was his preference.”

“No,” Seba said. “Some vampires disregard footwear as a matter of
course, but Paris is not one of them. He has commenced his trek to Vampire
Mountain, to attend the latest Council. When we undertake that trip, we cast
our shoes aside and travel barefoot. It is one of the rules of the clan.”

***

The Saga of Larten Crepsley: Birth of a Killer, Chapter 9