No they shouldn't be, and aren't. There is no duality to these celebrations. Jesus brought us a new covanant one which we are to follow without exception.
2 Tim 3:16 All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness:
17 That the man of God may be perfect, throughly furnished unto all good works.
All scripture includes the OT where most of the Jewish holidays arise from.
Further, all the major events of Jesus' first coming line up with Judaic spring festivals, end time Bible prophecy seems to point to all the major events of Jesus' second coming lining up with Judaic fall festivals.
If we don't know Judaism we'll never understand all of the bible. Remember Jesus was Jewish. He considered the festivals significant (He instituted them after all)
Note that this doesn't mean we are to observe them, we are free from the law after all, but they are still significant.