Hi Michael and everyone!
First of all, you're 100% qualified. I was nervous the first time I volunteered for the fair because I thought that people would ask all sorts of complicated questions about bee biology, but as it turns out, that's not what happens at all.
One "job" is to just talk to people who say things like "I heard that bees are in trouble", or who ask "is that really honey in there?", or who want to tell you stories about growing up with a relative who was a beekeeper. It's much more casual than you'd expect. If people ask, there are brochures you can hand out that have some background on the club and gardening tips, etc.
If someone does ask a question you don't know the answer to, it's absolutely fine to say "I'm fairly new to this and I don't really know much about that part of it, that would be a great thing to search for on the Internet!" And we try hard to make sure there are two people there, so you can share the questions.
But the main thing that happens in the booth is that people, especially kids, will ask about the bees in the observation hive. You can help them find the queen, point out brood, and so on. This year we have little benches in the shade that people can sit on and look at the observation hive, and I think there will be even more people than usual just hanging around and chatting.
In short, I think everyone reading this can volunteer -- and more importantly, enjoy it. I hope you will!