Don't get too drunk and make an arse of yourself . Dress nice, shower, smell good and be chatty and friendly. DO NOT let yourself feel jealous or pissy about everything that has happened. Do that in your own time. Don't walk out of the party if something happens you don't like, deal with it later. Be there but don't be in her face all the time. There are no "tricks"* but just don't make her dislike you and see what happens. *discounting the old drug her and plug her route