Is it a good idea to mention a job fair if I’m interviewing with the company the same day?

I have a first interview (recruiter phone call) scheduled with a company, and I realized they’ll also be at a job fair I’m attending later that same day. I got contacted pretty quickly after applying, so I’ll likely be one of the first interviewees.

Would it be smart to mention the job fair during the interview as a way to show interest, or is it better to not bring it up and just let things unfold naturally?