Col. 2:16-23 (ESV)
Therefore let no one pass judgment on you in questions of food and drink, or with regard to a festival or a new moon or a Sabbath.  These are a shadow of the things to come, but the substance belongs to Christ.  Let no one disqualify you, insisting on asceticism and worship of angels, going on in detail about visions, puffed up without reason by his sensuous mind,  and not holding fast to the Head, from whom the whole body, nourished and knit together through its joints and ligaments, grows with a growth that is from God.
 If with Christ you died to the elemental spirits of the world, why, as if you were still alive in the world, do you submit to regulations—  "Do not handle, Do not taste, Do not touch"  (referring to things that all perish as they are used)—according to human precepts and teachings?  These have indeed an appearance of wisdom in promoting self-made religion and asceticism and severity to the body, but they are of no value in stopping the indulgence of the flesh.
Let no one pass judgment on you in questions of food and drink, or with regard to a festival or a new moon or a Sabbath. This goes for Seventh day Adventists, and JWs as they run around telling you that you have to worship on Saturday and what not else. We worship on Sunday, that is the day Christ rose from the dead, and we find that something worth celebrating. But we could just as well worship on Thursday, and though that day was dedicated to Thor by our ancient pagan ancestors (hence it’s name) we would no more be worshiping Thor on that day, then we are celebrating Samhain when we go trick or treating on Halloween, or the sun God by celebrating Christmas on the 25th of December. We are free to celebrate what we want when we want.
We are also free to eat what we want and drink what we want. Christianity is not the practice of asceticism. I say this in the middle of lent, when I have imposed on myself quite the ascetic fast. A fast can be a good thing to take on. But it ought not be imposed on anyone. Nor should it be a point of pride for anyone. Our growth comes from God, through Christ our head. We have no need to submit to worldly regulations. We can do so in Christian freedom, but we don’t need to, and sometimes we should think twice about doing so. We are free to take the liturgical calendar and our church has found it helpful. So we do.
What I find funny though, is often this is used by people to shun the liturgical calendar, and the very same people ignore what it says almost completely. Rather than living and letting live they begin to condemn people for the food they eat, the drink they drink, and for having the audacity of dressing their kid up like Winne the Pooh for Halloween. It gets rather ridiculous.