I'll take a book with me, read it from the balcony looking inwards towards the party, and really hope that no weird girl will come and annoy me (please do)
Then I will have built up enough courage to go down, eat, drink, be merry! And I will be dancing with each and every one of you!! (Yes that's a threat 😏)
A 100% wearing something like this aaand being socially awkward, but in a very charming way (I'm staying close to the wall and not making eye contact with anyone, slowly moving closer to the exit)