The evening on 9 March is a celebration of the decade between 1993 and 2003, before the company's French owner Havas merged it with Partners BDDH and snipped off the Wnek Gosper appendage.
Proceedings are being organised by the former new-business director Christian Hinchcliffe, who is clearly not having enough fun with his new employer McCann Erickson, where he is a managing partner.
The soiree will be attended by the Lowe New York chief, Mark Wnek, and the McCann US president, Brett Gosper, whose names once adorned the agency's doors. Chris Pinnington, the worldwide chief operating officer, will also make an appearance.
The event is at the private members' club Adam Street, with a theme along the lines of "good, bad, fun old days back for one night only" sort of thing, apparently.