Question: Must you perform Sh’nayim Mikra V’Echad Targum (“SMVT”) for Yom Tov leinings, the four special parshiyos, or the weekly haftarah?
Short Answer: While you do not need to recite SMVT for Yom Tov leinings or the four special parshiyos, some have the minhag to do it for the four special parshiyos. Many have the minhag to do SMVT (at least the Mikra part) for the weekly haftarah.