Should true followers of Yehoshua celebrate Easter?

Here is a very concise article about this subject:

http://www.askelm.com/news/n010412.htm

Yehoshua's resurrection day memorial would not always fall on a Sunday - it will change from year with the Scriptural lunar calendar- Sunday has no relevance. Passover moves as well, "Yehoshua's Supper" is not always on the same day every year. Let's stick to keeping Yehoshua's Supper at Passover, whichever day of the week it happens to fall in any given year, as in Luke 22.19, Yehoshua said, “This do in remembrance of me.”