I work in a department of 11 people. I am very close with some and not with others. I was originally going to invite all of them, but I find myself needing to cut the guest list. It's not that many people, but with their spouses it adds up. My question is...would it be rude to only invite the coworkers I'm close with? I don't want to cause any tension in the workplace. Please give your advice. Thanks!