Because Hanukkah celebrates religious freedom, which Jews in hiding did not have.
The nation of Spain doesn't.The Jews living in Spain do.Their mode of celebration is similar to that of the Jews of Portugal, Turkey, Iran, Iraq, and the otherSephardic Jewish communities around the world, including those of Israel, the US, and the UK.
Christmas, Hanukkah, and birthdays if you count those as holidays.
Mostly Christmas. The Jewish minority in Norway celebrates Hanukkah. Only Jewish people or those of Jewish decent celebrate Hanukkah.
First of all, Karaites (who have no Hanukkah) are not to be considered normative Jews in any sense.To answer your question, No. There are no complete Jewish communities that ignore Hanukkah. There are individual(non-religious) Jews who ignore Hanukkah, just like there are individual non-religious Jews who disobey any combination of the Torah's commands or those of our sages.
The informant that betrayed those in the Annex was never determined.
There is no clothing associated with Hanukkah, but my recommendation would be not to wear red or green, because those colors are associated with Christmas.
Those in the annex were in hiding - almost to the day - two years and one month.
The Jewish people celebrate Hanukkah where ever they are including the Canadian jews. The days are not typically official holidays. Most schools and businesses will make allowances for those that are celebrating.
Most American and Canadian Jews celebrate both of those holidays.
Those who practice Judaism celebrate Hanukkah by eating latkes. They do many other things during the eight days of Hanukkah, but latkes are a popular treat during this time.
All of those are Jewish festivals.
If someone in hiding, like Anne Frank, got sick and needed medical care, it would have posed a significant risk to their safety. Seeking medical attention outside could have exposed their secret hiding place to authorities or others who would betray them. They would have likely had to rely on home remedies or clandestine medical help from trusted individuals within the hiding place.