Civil days of thanksgiving are okie dokie. I celebrate Reformation Day and Thanksgiving within the realm of the Westminster Confession:
However, I also reject man-made holy days that is thought to be set-apart. Here I agree with the Westminster Divines as well:
The distinction comes down to: Is the day a civil day of thanksgiving (lawful) or a religous holy day (unlawful).
V. The reading of the Scriptures with godly fear,[17] the sound preaching [18] and conscionable hearing of the Word, in obedience unto God, with understanding, faith, and reverence,[19] singing of psalms with grace in the heart;[20] as also, the due administration and worthy receiving of the sacraments instituted by Christ, are all parts of the ordinary religious worship of God:[21] beside religious oaths,[22] vows,[23] solemn fastings,[24] and thanksgivings upon special occasions,[25] which are, in their several times and seasons, to be used in an holy and religious manner.[26]
17. Luke 4:16-17; Acts 15:21; Col. 4:16; I Thess. 5:27; Rev. 1:3
18. II Tim. 4:2; Acts 5:42
19. James 1:22; Acts 10:33; Matt. 13:19; Heb. 4:2; Isa. 66:2
20. Col. 3:16; Eph. 5:19; James 5:13; I Cor. 14:15
21. Matt. 28:19; I Cor. 11:23-29; Acts 2:42
22. Deut. 6:13; Neh. 10:29; II Cor. 1:23
23. Psa. 116:14; Isa. 19:21; Eccl. 5:4-5
24. Joel 2:12; Est. 4:16; Matt. 9:15; Acts 14:23
25. Exod. 15:1-21; Psa. 107:1-43; Neh. 12:27-43; Est. 9:20-22
26. Heb. 12:28.
However, I also reject man-made holy days that is thought to be set-apart. Here I agree with the Westminster Divines as well:
Touching Days and Places for Publick Worship.
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.
Nevertheless, it is lawful and necessary, upon special emergent occasions, to separate a day or days for publick fasting or thanksgiving, as the several eminent and extraordinary dispensations of God's providence shall administer cause and opportunity to his people.
As no place is capable of any holiness, under pretence of whatsoever dedication or consecration; so neither is it subject to such pollution by any superstition formerly used, and now laid aside, as may render it unlawful or inconvenient for Christians to meet together therein for the publick worship of God. And therefore we hold it requisite, that the places of publick assembling for worship among us should be continued and employed to that use.
The distinction comes down to: Is the day a civil day of thanksgiving (lawful) or a religous holy day (unlawful).