The real question, and appropriate discussion is, was this dinner a glorification of indulgence.
Kinda. Some believe there’s nothing wrong with glorifying something which isn’t assur in the SH”A (which i’m still not so convinced of).
The next question is, if you believe it is, is this the proper forum to give tochacha (or a mussar shmooze) to those who attended.
Not sure about that but it surely is the right place to complain about “a dinner somewhere”.