Christmas, Easter, Halloween, Thanksgiving, Valentines Day, etc. Are any of these days found in scripture? Did YHWH the creator of Heaven and Earth command us to celebrate these days or are they of evil origins?

Our Father YHWH has given us Appointed Times (Moedim) and feasts that we are to celebrate (that are found is scripture) to Him as an everlasting covenant between Him and us His servants and not the secular holidays that are celebrated in the world. We know that we are supposed to worshipping Him in truth and that is by being completely obedient to His Word and not turning to the right or to the left. Below are the annual Holy days/feasts/fasts that we are to observe and a description of each. Below is a chart of all the days commanded by YHWH to celebrate each year, below are the dates for 2020 and we will update the list annually. 

2020 Holy Day Calendar

Remember these days are Sabbaths meaning you are not to work on any of these days. Also a day starts at sundown; therefore each holy day starts the night before at sundown and not midnight. Cooking is permitted on all the days except for the weekly 7th Day Shabbat and Yom Hakkipurim (Yom Kippur) because they are complete no work days (Shabbat Shabbaton's).

Sabbath Day (Every week at sundown on Friday night to sundown Saturday night)

I believe the best calendar to follow for the Appointed Times is one by Asherit Dead Sea Scrolls where they base it off of the Enoch calendar, which was one of the Books removed from Scripture: https://c10.patreonusercontent.com/3/eyJhIjoxLCJwIjoxfQ%3D%3D/patreon-media/p/post/32532729/e47d110d98ef4d94bf51d7952d644ec5/1?token-time=1583373649&token-hash=4jK8nRdI8J2WEVV7JFVLE2n3XjAr0UpcIxWFGBq_iV8%3D