I am going on a date with a really smart guy, and I don't wanna look like an idiot!

So there is this guy I am going to meet in almost 10 days, and from what I heard he’s super smart. I personally am not that smart, I have little knowledge of things different from my career. I believe in the concept of “being myself” when going on that date with him so I am not going to pretend to be someone I am not, however, I’d like to avoid the embarrassing scenario in which I look dumb compared to him.
Considering the short time I have left till the date, I’d really appreciate it if someone would suggest topics I could read about to widen my knowledge. I am sure it will help not only in my date but also it will make me learn about things I may not have considered learning about before.
Thanks in advance!