Been thinking about this since yesterday: food stall prices at bon odori are almost the same as, or even higher than donki's prices. And the food quality is meh while some of them are really bad(sry Ipoh lang very high standards). Maybe next year I should propose to my friends that we each bring something that can be shared with each other like some katsu, okonomiyaki, takayoki etc. from donki and probably some pizza/sandwiches + drinks/dessert.
Yeah, the price there is really jacked up probably due to the rental, and the food is okay okay only, but i like your idea of bringing your own stuff to picnic there 🙈