Weekend class

I just finished up one half of a class that is only on weekends. That is Friday-Sunday. There are a couple of problems with a weekend class. First and most obvious, it requires you to give up a whole weekend from start to finish. Second, nobody believes you when you say you have a weekend class. They think it means a Saturday class. So you get a lot of comments like, "You have school on Sunday? You lie!" or, "Isn't it a bit unusual to have a class start on a Friday night?" with a somewhat sarcastic tone of disbelief. "Sure, I understand, if you don't want to go out with us, why don't you just say so?" And stuff like that.