Duo wanders the crowds. If he's going to show up mysteriously in a strange city he's never heard of, then doing so in the middle of a festival is a good time to do it. Gives him a good chance to mingle with people and get a feeling for what this city is like. He can sense that these are people who normally don't have a lot to celebrate. They're throwing themselves into it like they're desperately trying to forget tomorrow. It's a bit unnerving.

On the other hand, those sweet potato things smell really good, and he's very hungry. Perhaps there's no reason you can't perform initial reconnaissance and enjoy a festival at the same time.

"I'll take two Yako Imo please."