And Paul does not keep Easter, he says in I Corinthians 5:7-8, what to do/keep. But the peoples just as was before have to do things their way.
The Messiah of Israel will be setting up the "order of things" during the 1,000 year reign, on this earth, over all the nations of the world, at that time -- when He is seated upon the Throne of David, in Jerusalem (which is not too far away now).
So, I'll be following what the Messiah of Israel sets up and mandates for all, at that time. I won't have any problem with it.
We'll see what He does then.
That is your choice to 'wait' to see, but Christ said when He walked in a flesh body, I have foretold you all things.... Yes, some people are going to be taking classes for a thousand years to get it right.