From Paul Flynn's "Christmas, Christian Liberty, and Antinomianism":
A holiday or holy day is a religious day set apart to cease from work and to observe something else. How many people work on Christmas Day? Very few people. What kind of works are usually done on Christmas Day? Works of necessity and mercy (i.e. doctors & nurses). People who abhor such a standard being held for the Lord's Day do not say anything against such a standard on Christmas Day. God set apart the first holy day at Creation (one day in seven). It is not burdensome; it was given for man's benefit and should be his delight. However, Christmas and Easter (man-made set apart holy days of the post-church calendar from Romanist tradition) has become man's delight.
"If thou turn away thy foot from the sabbath, from doing thy pleasure on my holy day; and call the sabbath a delight, the holy of the LORD, honourable; and shalt honour him, not doing thine own ways, nor finding thine own pleasure, nor speaking thine own words: Then shalt thou delight thyself in the LORD; and I will cause thee to ride upon the high places of the earth, and feed thee with the heritage of Jacob thy father: for the mouth of the LORD hath spoken it," (Isa. 58:13-14).