The Moadim are mentioned throughout the Bible, Old and New testament, and is the word for appointed sign or time, sacred assembly, festival or feast. Colossians 2:15-17; "He disarmed the rulers and authorities and put them to open shame, by triumphing over them in him. Therefore let no one pass judgment on you in questions of food and drink, or with regard to a festival or a new moon or a Sabbath. These are a shadow of the things to come, and the substance belongs to Christ." The Hebrew word for festival is Moadim. From this verse we can gather that the very substance of them is from Christ, further they are connected with 'disarming rulers and authorities as well as triumphing over them!' Some translations have inserted the word "only" before a shadow, thus changing the entire meaning. However, if you look in the original Greek, the word only in this text is non-existent.
To further expound upon the relevance of currently celebrating the Feast days in modern times, The Moadim (Appointed Times or Festivals,) we will look at Zephaniah 14:16, "Then everyone who survives of all the nations that have come against Jerusalem shall go up year after year to worship the King, the Lord of hosts, and to keep the Feast of Tabernacles." If the Moadim were non relevant, why would Yeshua have all the nations celebrate Feast of Tabernacles after He returns?
The Moadim are so important they are even mentioned in the 1st chapter of the bible: Genesis 1:14; And God said "Let there be lights in the vault of the sky to separate the day from the night, and let them serve as signs to mark the sacred times, and days and years. The word for sacred times is Moadim. According to this verse, we can deduce they are so significant God even marks them in the heavenlies.
There are 8 sacred and powerful Moadim in the Bible, Passover, Unleavened Bread, First Fruits, Feast of Weeks, Trumpets, Atonement, Tabernacles & of course the Sabbath. (Leviticus 23 mentions how they are to be celebrated and they will be celebrated throughout perpetual generations and forever!)
Here are more New Testament references to The Moadim, where Yeshua and His disciples celebrated them: Passover: Matt 26:17; Luke 2:41: 22:15; Heb. 11:28 Unleavened Bread: Matt. 26:17; Acts 20:6; 1 Cor. 5:6-8 Penetcost/First Fruits : Acts 2:1 Tabernacles: John 7:2.
This is only scratching the surface of what The Moadim are, but according to scripture, we see The Moadim as a glorious way to bring down spiritual strongholds, joyous festivals that God Himself appointed, and a way to powerfully honor Messiah.