Celebrate Christmas in the Right Spirit at Work: Don't...
Get too Friendly With Your Bosses
Just because the top management is going to be present there, it doesn't mean you can use these parties to elevate yourself up the career ladder. They might smile and talk to you out of professional courtesy, and that does NOT mean that they are your best friends. Talk politely, and move on.
Uhm no. Just because it's an opportunity to get all dressed up, you must look festive, but also respectful. Don't arrive at the party as if you're here for hen night or a bachelor's party.