What you have worked so hard to achieve will soon be yours.
These words will be your mantra at this time: I don't know, but together we can find out. It's okay to admit that you don't have all the answers, and it's even more powerful when you share the burden of finding those answers with others. Harness the collective knowledge, experience and passion of the people around you and learn together.
Work functions are still work, no matter what your colleagues might say. One drink too many can lead to disastrous comments or actions. Stay sober and stay in control.