If you make a Sheva Brachos meal for a new Chosson and Kallah and your Panim Chadashos (new person) does not show up, can you still say the Sheva Brachos?
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Especially if it's Shabbos or Yom Tov, some have the minhag to say it anyway (Shulchan Aruch Even Ha'ezer 62:8). The "Asher Barah" blessing may be said even if there are no Panim Chadashos (62:7).
Not an authoritative answer at all, but: I have known cases where a sheva b'rachos host would call around to various people to find a last-minute "panim chadashos". As always, CYLOR.