It's not the norm that couples ask for cash - THAT would be rude. The responsibility for knowing falls on the guest. It's rude to attend if you can't cover your plate and your presence wouldn't really be missed by the couple or perhaps their parents.
Guess I never knew the wedding etiquette.
And I probably will not attend many more weddings without a lot of nagging.
I got kind of put off giving around $500 in gifts/cash to a nephew in law who’s marriage lasted less than a week.
Almost asked for the gifts back.