Complete Persona 5 Walkthrough, which breaks up the game into months, main days, and Palaces.

Days without guides are almost always days where you are free to do whatever you want or days that are skipped over. There are also the rare days where something very small happens, such as helping Sojiro with the dishes on the 3rd of May, that have been left out due to not having an impact on the story or for being very short.