“Let’s end the wedding madness”
Actually the Gemarah says such a thing
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Speaking from a practical, mentchliche angle, there is purpose for neighbors and acquaintances participating. It’s showing that YOU make a difference to them, you exist. Even a cordial Mazel Tov, a couple of minutes suffice, but it makes a difference. After a simchah one dose recall who attended, it does stick out, it does make a difference.
Funny thing, just today I recieved a wedding invitation envelope, WITHOUT THE INVITATION!!! Hey what does that mean? You’re uninvited?!?