For those who oppose the celebration of Holy Days, if a church celebrated Reformation Day would that violate the RPW?
21:5 The reading of the Scriptures with godly fear; the sound preaching and conscionable hearing of the Word, in obedience unto God, with understanding, faith, and reverence; singing of psalms with grace in the heart; as also, the due administration and worthy receiving of the sacraments instituted by Christ; are all parts of the ordinary religious worship of God: besides religious oaths, vows, solemn fastings, and thanksgivings, upon several occasions, which are, in their several times and seasons, to be used in a holy and religious manner.