the Mishna berura 493 SK 5 is matir to take a haircut and get married erev shabbos rosh chodesh. However it seems that he is only saying it for those who hold 2nd half that they are allowed to take a haircut on rosh chodesh itself only if it is also lkovod shabbos rosh chodesh. But REb Moshe in BEin pesach lshvous 10:22 that even those who keep first half can be meikil.
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