In describing Pokémon GO Fest in an earlier post I framed it terms of the Four Act Kishōtenketsu story structure.
You can find a lot of discussion of this structure on the web, particularly in how it relates to Japanese video game design. But here are a couple posts about the idea that I think are instructive:
The significance of plot without conflict
This was the first detailed discussion of the structure I found on the internet.
The Kishotenketsu struture of Digimon Adventure tri: an insight to traditional Japanese storytelling
This post looks at a specific anime, but goes into the cultural background of the structure, with some references for further study. It also makes me want to rewatch Digimon Adventure tri to better understand some of the puzzling aspects of that series.