Gilbert is extremely awkward and undereducated about sex. He was never really taught about it as a kid and growing up never had any interest in relationships of any kind, so even as an adult he comes about it slowly. He knows much more now, but still feels really strange about any kind of sexual thoughts or contact.
Since Gilbert has no country to celebrate with, most holidays he travels country to country / timezone to timezone and celebrates things with other friends who are lucky enough to have citizens and a ‘large family’ to laugh and have fun with.
On extremely special holidays he’ll most likely spend the day with either Ludwig or Elizabeta and Roderich.
England absolutely refuses to admit the fact he’s a lonely person. Everyone can tell, but naturally he considers this fact a weakness and hates allowing his weaknesses to overpower him.