When hosting a potluck is there an unwritten rule about who provides the main dish? I've always done so -- it seems the gracious thing to do --- and then let my guests provide sides, dessert, appetizers, etc. Recently I've been invited to potlucks and have been asked to bring the main dish (after all the side dishes were spoken for). This feels a bit rude to me (I didn't offer) but I wonder if I'm just getting crotchety in my old age, or what? I think the host should provide the main... what do my fellow 52rs think?