UPDATE: Since this story was published, more firms have announced plans to observe the Juneteenth holiday by closing their U.S. offices or encouraging employees to take a paid day off. They include: Akerman; Akin Gump Strauss Hauer & Feld; Arnold & Porter; Baker Botts; Cadwalader, Wickersham & Taft; Cahill Gordon & Reindel; Clifford Chance; Cooley; Covington & Burling; Crowell & Moring; Davis & Gilbert; Davis Wright Tremaine; Debevoise & Plimpton; Dorsey & Whitney; Freshfields Bruckhaus Deringer; Greenberg Traurig; Haynes and Boone; Hogan Lovells; Jackson Lewis; Jenner & Block; Katten Muchin Rosenman; Kilpatrick Townsend; Kramer Levin; Latham & Watkins; Littler Mendelson; Mayer Brown; Morgan, Lewis & Bockius; Morrison & Foerster; Munger, Tolles & Olson; Nixon Peabody; Ogletree, Deakins, Nash, Smoak & Stewart; Patterson Belknap Webb & Tyler; Paul Hastings; Paul, Weiss, Rifkind, Wharton & Garrison; Perkins Coie; Reed Smith; Ropes & Gray; Seyfarth Shaw; Shearman & Sterling; Simpson, Thacher & Bartlett; Smith, Grambell & Russell; Squire Patton Boggs; Stroock & Stroock & Lavan; Willkie Farr & Gallagher; Wilmer Cutler Pickering Hale and Dorr; Wilson Sonsini Goodrich & Rosati; and Winston & Strawn. 

Several Am Law 100 firms have announced that they will observe Juneteenth, which celebrates the liberation of the last group of enslaved black Americans in the Confederacy, as a full or partial work holiday next week.