I have been to a few parties
Don't over analyse. Go with the flow and have fun. Clearly don't be a knob but in asking your question I am sure you are not in that category.
I have tended to be a slow starter at events, and on one occasion that enamoured me to a couple of girls who made sure I got special treatment. They singled me out for a treat!
Every event has different dynamics so I would plan on doing more than one. Let's be honest, the first time you do anything is it perfect? Probably not, but you keep improving