I took my 6 year old daughter to the yosakoi festival in August 2019 and while she may have been slightly overwhelmed by the whole trip at that age, we certainly had a great time. The dancers are so energetic! The whole city was alive with them, with team after team dancing past, and others running back and forth from one venue to another, despite the temperatures near 90 degrees F every day and plenty of humidity. At home I'd be huddled indoors by an air conditioner in such weather, but in Japan the energy was contagious and I had no problems hoofing around the city for hours on end. I sure sweated out a lot of liquids, though.
If you are not familiar with the yosakoi dancing, these huge teams of dancers from all over Japan come to Kochi City. They have these big trucks with powerful loudspeakers and DJ's aboard, and usually pretty girls too, and sometimes live musicians.The trucks crawl down the city streets with the dance teams following behind. The music is so loud you can definitely feel it booming through your body, though it seemed much less hard on the ears than I remember from 15 years before... maybe they have shifted to lower sound frequencies? The dance teams and their music vary from modern styles, perhaps hip-hop influenced or whatever, to more tradional Japanese sounds and costumes. Many of the teams have these muscular guys taking turns waving HUGE flags around and around. The whole event is really colorful and loaded with beautiful people of both sexes.