What is this holiday Jesus celebrated?

It's  Hanukkah, and it seems strange that Christians don't celebrate it.  If Haman had succeeded in killing all Jews, then there would be no Jesus story to tell.

There is an interesting article on the festival of Dedication on jw.org which includes so much                      imformation on the whys and wherefores It was something to do with rededicating the temple after it was taken back from the Syrian conquerers

Dedication, Feast of the 


( John 10:22 John 10:42 ), i.e., the feast of the renewing. It was instituted B.C. 164 to commemorate the purging of the temple after its pollution by Antiochus Epiphanes (B.C. 167), and the rebuilding of the altar after the Syrian invaders had been driven out by Judas Maccabaeus. It lasted for eight days, beginning on the 25th of the month Chisleu (December), which was often a period of heavy rains ( Ezra 10:9 Ezra 10:13 ). It was an occasion of much rejoicing and festivity.But there were other dedications of the temple. (1) That of Solomon's temple ( 1 Kings 8:2 ; 2 Chr 5:3 ); (2) the dedication in the days of Hezekiah ( 2 Chronicles 29 ); and (3) the dedication of the temple after the Captivity ( Ezra 6:16 ).

In 168 B.C.E., the Syrian Seleucid ruler Antiochus IV, in his effort to eradicate Jewish worship and customs, had a pagan altar erected atop the altar in Jehovah’s temple in Jerusalem. Upon it, he had sacrifices offered to the Greek god Zeus.

This incident sparked the Maccabean uprising. The Jewish leader Judas Maccabaeus recovered Jerusalem from the Seleucids and then had the defiled altar demolished and a new one built in its place.

 Exactly three years after the altar had first been desecrated, Judas rededicated the cleansed temple to Jehovah. This “festival of dedication”  has been celebrated in December by the Jews ever since. Today, the festival is known as Hanukkah.

Look in Maccabees.

The annual day of remembrance for the cleansing of the temple after its defilement by Antiochus Epiphanes. The celebration began on Chislev 25 and lasted for eight days.​—Joh 10:22.

The Feast of Dedication mentioned in the New Testament Book is Hanukkah.  John 10:22 tells the origins of the Feast of Dedication as recorded in the First Book of Maccabees.

Non Jews are not interested in celebrating Hanukkah.