Getting a Haircut:[1]

It is customary for the Sandek, Mohel, and the father of the child to get a haircut in honor of the Bris. [It is best to do so the day before the Bris, and not the day of the Bris.[2]]

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[1] Admur 493:4; Migdal Oz Nachal 9; Shevach Habris 17:7; Pesakim Uteshuvos 265:1 footnote 2-5

[2] See Nachlas Tzevi 262:1; Daas Torah of Maharsham 262; Peri Hasadeh 3:75; Poskim in Pesakim Uteshuvos 262:6 footnote 39 and 44; See Halacha 2 above!