etiquette

etiquette 

noun. proper social behavior 

"If you are heading to a Super Bowl party this Sunday, a good etiquette is to bring some food or drinks."

"The couple exhibited poor etiquette when leaving the party without saying goodbye to the host."

"Skip the handshake: office etiquette in flu season."

http://www.vocabulary.com/dictionary/etiquette?family=Etiquette