The new patch rebalances time slots:

If you can't find a suitable walkthrough, consider creating your own based on your experience with "Happy Summer" v0.62. Here’s a basic outline:

“If no girls are in the Bathroom, scroll through the rooms by clicking the arrow next to the room's name until you get to the Bathroom.” Steam Community · 4 years ago Happy Summer 0.2.7 Walkthrough Guide | PDF - Scribd

Two events are to version 0.6.2. Miss them, and you cannot achieve the 100% completion.

Version 0.6.2 typically introduces a new character or expands a minor one (often the or a Shop Clerk ).