What actions can I take to let him know for sure I like him and to convince him to pursue me?

Male friend and I are going out with a group of mutual friends in a few days. I asked him to hang out at this event and he accepted. How do I make it obvious that I like him and make him want to pursue me without looking stupid or desperate?

What actions can I take to let him know for sure I like him and to convince him to pursue me?
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