I'm hanging out with my crush soon, how can I interest him? :)

I'm going to be around him soon, but there will be other people around..but I want to talk to him and make him laugh. I am the worst flirt in the entire world, are there any tips? He's a sports fan, and he is really funny so I just need a way to make him laugh and keep him interested, not bored. (besides the classic "be myself", I already do that.) And what should I wear and how to do my hair? it's a casual indoor hangout, and I have long brunette hair..any hair/clothes ideas?
I'm hanging out with my crush soon, how can I interest him? :)
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