How to impress a family friend?

I'm going to my mums 50th. I'm wearing a bodycon so i look super sexy. It's family and friends. Our family friend is so sexy, i wanna get off with him. How, other than looking the part, can i show him i want a good time? Also most important, how can i get him by himself with no one to see? Also this weekend, it's my aunts bbq, more chance he'll be at that, same questions apply. No lecture's please. Sorry, and i went on a family holiday for a week. he was therebut we didn't speek. Will this make it seem like i'm not interested?