What to say when meeting your favorite Muslim public speaker?

Salam everyone! So I’m super excited-I got tickets to see this Islamic speaker I really look up to, and it’s one of those meet-and-greet things with pictures. But now I’m like, uh, what do I even say? He’s helped me so much, seriously inspired me, but I’ve never really done this before. He’s not an imam, more like a speaker who talks about Islam. What do people usually chat about when they meet someone like that? Like, any tips? I don’t want to just freeze up, you know?