a. to be polite and to respond timely to invitations because you shouldn't be a douchebag and say MAYBE to an invitation because you know people have to fucking cook for a certain amount of people!!!
b. to talk to other guests at a dinner party and not avoiding eye contact and acutally listening to the hostess when she says "please sit down"
c. not being a major douchebag
"hey, can you sit down and have some common courtesy for your hostess?"