As YOU define them.
Christ's birth, death and resurrection reveal to all those with eyes to see the days that should be holy to us.
The incarnation of God as man? Holy.
His ultimate sacrifice on the Cross? Holy.
His resurrection from the dead? Holy.
The dangerous ground lies beneath the man-made proto-Hebraeic legalisms I'm reading here.
God sends his spirit to us to lead us to truth.
And His spirit is not present in a scornful and malinspired rebuke of the joyful celebrations of His Resurrection.
I agree. The gentile Christians were not placed under the levitical dietary restrictions
Ac 21:25 As touching the Gentiles which believe, we have written and concluded that they observe no such thing, save only that they keep themselves from things offered to idols, and from blood, and from strangled, and from fornication.
Nor under levitical calendar
Gal 4:9 But now, after that ye have known God, or rather are known of God, how turn ye again to the weak and beggarly elements, whereunto ye desire again to be in bondage?
10 Ye observe days, and months, and times, and years.
11 I am afraid of you, lest I have bestowed upon you labour in vain.
Absolutely not:
Lev 23:2 Speak unto the children of Israel, and say unto them, Concerning the feasts of the LORD, which ye shall proclaim to be holy convocations, even these are my feasts.
Lev 23:3 Six days shall work be done: but the seventh day is the sabbath of rest, a holy convocation; ye shall do no work therein: it is the sabbath of the LORD in all your dwellings.
Lev 23:4 These are the feasts of the LORD, even holy convocations, which ye shall proclaim in their seasons.
Lev 23:5 In the fourteenth day of the first month at even is the LORD's passover.
Lev 23:6 And on the fifteenth day of the same month is the feast of unleavened bread unto the LORD: seven days ye must eat unleavened bread.
And the chapter continues with God specifically telling us when and how to observe HIS holy days.
This is God defining his holy days. Not me.