The question then becomes did the Lord give us the feasts or are the feasts only tradition?" I think also we need to ask ourselves if the feasts are only given to the Israelites as a reminder of God's laws or are they a celebration God suggests for us. Circumcision, mixing fabrics, special diet, etc. were given only because they helped the Israelites know and keep the law, they were physical and not the spiritual law. We don't need to follow those things.
I think the feasts are different. They teach us about the Lord and they prophesy what the Lord does for us. I think the Lord wants us to be aware of them and learn what they tell us. The enphasis in the feasts is not on a physical act, it is not specifying foods, it is praising and celebrating.
In Zechariah 14, as it speaks of the last days: Zech. 14:19 This shall be the punishment of Egypt and the punishment of all the nations that do not come up to keep the Feast of Tabernacles.