Hogmanay it's New Year's Eve with the pagan roots. Scots usually start to celebrate in on 29th Dec. and enjoy themselves as much as four days including 1st January! However, I've found very close to my place one ancient village where people regularly celebrate Hogmanay once again on 11th January 11! So it's like in Russia at Old New Year 13th Jan. but local tradition is very different: https://multi-marin.ru/hogmani/ (this article is in Russian but there is online translator for many foreign languages)