Greek nameday celebration
"Today is your Nameday and it's a tradition to go out and buy your friends a drink. You should also have one yourself! You don't want your friends to think that you are impolite or a wet blanket."
Oh please... They are my friends and they love me, they don't need me to buy them drinks or drink with them to prove my friendship. And we don't have to drink alcohol in order to have a nice time!