I went and drafted all of Shiori's remaining events (6/6). I wrote most of them on my computer, as opposed to my phone (like the original set of events), so they're a bit longer. I might have to extend some of Izumi's events to compensate...
Also, I'm starting to get an idea on how to potentially include the "side couples" feature. I always planned on having them triggered from weekly events, but wasn't really sure how without having everyone take Himeka's advice on dating. For at least one of them, I'm thinking of having 2-3 events where someone comes to Himeka asking for help Himeka can't provide, and if Himeka sends them to someone they're compatible with they might end up together.
Example: Nanami needs help with preparing a recipe she's trying for her club. Himeka doesn't know about cooking, so she can suggest a few people she thinks are good at it. (For this example, Atsuko/Kiyomi/Shiori.) Atsuko is still annoyed at Nanami for what happened in their intro event, so this choice can't get them together (and may hurt their chances if there is an event to get them together). But if Nanami is sent to one of the others, they might get closer and end up going out.
Another idea for a "nice to have" feature is having randomized weekly events. Aside from the intro events (Weeks 1-4) and the finale event (Week 17), maybe weekly events could be randomly picked from a list. This could add some replay value as well as allow for additional content to be added after the game jam.
That's all I have for now. I'll probably finish up Kiku's events next, since hers are already started. I'll also want to release another demo after enough new stuff has been added, but I might need to start on the weekly events before I do that...