Interesting ommission:
Jesus went to the Temple on the Feast of the Dedication of the Temple. That shows that he was observing a feast only prescribed in what most Protestants incorrectly call "The Apocrypha." (There's a good reason he had special devotion for it... it was his birthday, Dec. 25th)
2 Maccabees describes how the Jews offered atonement for their comrades who had fallen in battle while committing sin. They collected the war loot and offered it to the priests of the Temple, who rededicated the Temple. And on Dec. 25th, the Spirit of the Living God came among Men to dwell in the Temple.
John 10:22-30
"...And it was at Jerusalem the feast of the dedication, and it was winter. And Jesus walked in the temple in Solomon's porch. Then came the Jews round about him, and said unto him, How long dost thou make us to doubt? If thou be the Christ, tell us plainly. Then came the Jews round about him, and said unto him, Jesus answered them, I told you, and ye believed not: the works that I do in my Father's name, they bear witness of me. But ye believe not, because ye are not of my sheep, as I said unto you. My sheep hear my voice, and I know them, and they follow me: And I give unto them eternal life; and they shall never perish, neither shall any [man] pluck them out of my hand. My Father, which gave [them] me, is greater than all; and no [man] is able to pluck [them] out of my Father's hand. I and [my] Father are one."
This is an example of a holiday that is not commandmended to be kept by God. Obviously observing it is not wrong. The difference is that it does not attempt to replace or supplant God's holy daysl. 2 Maccabees even shows that the kept God's Holy days:
2Ma 10:5 Now upon the same day that the strangers profaned the temple, on the very same day it was cleansed again, even the five and twentieth day of the same month, which is Casleu.
2Ma 10:6 And they kept the eight days with gladness, as in the feast of the tabernacles, remembering that not long afore they had held the feast of the tabernacles, when as they wandered in the mountains and dens like beasts.
And as a sidenote, there is no mention of December 25th in 2 Maccabees.