"It was for this very reason that in Calvin's Geneva you could have been fined or imprisoned for celebrating Christmas.It was at the request of the Westminster Assembly that the English Parliament in 1644 passed an act forbidding the observance of Christmas, calling it a heathen holiday. In an appendix to their 'Directory for the Public Worship of God' the Westminster divines said: 'There is no day commanded in scripture to be kept holy under the gospel but the Lord's day, which is the Christian Sabbath. Festival days, vulgarly called 'Holy-days', having no warrant in the word of God, are not to be continued.' (See also, James Bannerman, The Church of Christ, Vol. 1, pages 406-420). When the Puritans came to America they passed similar laws. The early New Englanders worked steadily through December 25, 1620, in studied neglect of the day. About 40 years later the General Court of Massachusetts decreed punishment for those who kept the season: '...anyone who is found observing, by abstinence from labor, feasting, or any other way, any such days as Christmas Day, shall pay for every such offense five shillings'" (Is Christmas Christian?, https://www.swrb.com/newslett/actualNLs/Xmas_ch2.htm).
Abrogation of Festivals. On Sunday 16 November 1550, after the election of the lieutenant in the general Council, an edict was also announced respecting the abrogation of all the festivals, with the exception of Sundays, which Godhad ordained. – Register of the Company of Pastors (Geneva, 1550).
"All human inventions which are set up to corrupt the simple purity of the Word of God, and to undo the worship which he demands and approves, are true sacrileges, in which the Christian man cannot participate without blaspheming God, and trampling his honour underfoot." - John Calvin, on the Puritan Hard Drive
"The word for Christmas in late Old English is Cristes Maesse, the Mass of Christ... Christmas was not among the earliest festivals of the Church. ... In the Scriptures sinners alone, not saints, celebrate their birthday.
George Gillespie, one of the Scottish Commissioners to the Westminster Assembly, and one of the greatest theologians since the days of the Apostles, writes,
"By communicating with idolaters in their rites and ceremonies, we ourselves become guilty of idolatry; even as Ahaz, 2 Kings 16:10, was an idolater, eo ipso, that he took the pattern of an altar from idolaters. Forasmuch, then, as kneeling before the consecrated bread, the sign of the cross, surplice, festival days (like Christmas-ed.), bishopping, bowing down to the altar, administration of the sacraments in private places, etc., are the wares of Rome, the baggage of Babylon, the trinkets of the whore, the badges of Popery, the ensigns of Christ's enemies, and the very trophies of antichrist, -- we cannot conform, communicate and symbolise with the idolatrous Papists in the use of the same, without making ourselves idolaters by participation. (A Dispute Against English Popish Ceremonies, in Gillespie's Works vol. one, p. 80, SWRB reprint, or as free MP3s atA Dispute Against the English Popish Ceremonies, emphases added).