It's a good etiquette to bring something when invited. But people shouldn't put down those who haven't brought anything to share.
this is a potluck
and everyone gotta make an effort to at least bring a dish
the fried noodle my wife make cost like $10
i'm not hosting
if it was me, hosting
i just kill a goat for us all to eat
no need to bring anything
lemongrass spell P=pebhmong