Romans 14 tells me that the choice of which day to onor is mine. One man esteemeth one day above another: another esteemeth every day alike. Let every man be fully persuaded in his own mind.
6 He that regardeth the day, regardeth it unto the Lord; and he that regardeth not the day, to the Lord he doth not regard it. He that eateth, eateth to the Lord, for he giveth God thanks; and he that eateth not, to the Lord he eateth not, and giveth God thanks.
7 For none of us liveth to himself, and no man dieth to himself.
Nowhere in those scriptures does it reference the sabbath any other of the Lord's holy days. There are greek words (sabbaton and heorte) that would be used if those were the "days" being referred to.
In addition the word translated "Regardth" has nothing to do with worship or sabbath keeping.
In context Romans 14 is clearly talking about eating practices and not worship practices. Modern Christianity often uses these verses out of context and in a way that Paul was not intending in order to justify disobeying the sabbath commandment.