Source h/t מורשת חכמי אמעריקא
There are pictures of the seudas haChasunah, but this seems to be the kabbolas ponim, and it seems like it's a פרסום ראשון - at least in the blogosphere. It's hard to be a פרסום ראשון when it's already online. Right, standing, is Reb Binyomin Levitin, o"h. Seated second from right is the Kopycznitzer Rebbe. Next to him is RaSHaG, the chosson, Reb Eli Chaim Carlebach speaking to his shver Reb Zalman Schneerson, The Rebbe, Reb Lazer Silver, Reb Moshe D. Rivkin, RY of Yeshivah Torah Vodaath. The bochur'l behind the Rebbe is Sholom Ber Gorodetzki. The bearded man second from left is Moshe Pesach Goldman. Seated across RMDR and RLS is Reb Mordche Groner, father of Rabbi Yitzchok Groner and יבלחט"א Leibel. Reb Zalman was a first cousin to the Rebbe's father. His father Reb Mendel was Reb Boruch Schneur's brother. The wedding took place, IIRC, on ט"ו אדר תש"ט in New York. The Ponovizher Rov also attended, as can be seen here:
r-l: the chosson, RZS, RaSHaG, The Ponovizher Rov, The Rebbe and RLS.