I'd like to suggest a calendar planner on ACC. It would be nice if you could fill in dates and times for when you have play dates with people or if you are to remember someone's birthday. It would also be extremely helpful to those who have shops or services and need to keep track of what time and when they would need to go and visit someone's town for a sale. It would be nice if it also had a function where it would send you a PT or reminder of an upcoming event. It helps everything keep organized so there's no confusion about who you need to keep a schedule with.
I love this idea! I agree that it would be great for keeping track of birthdays, deliveries, and more. I also really like the PT/reminder detail you mentioned. However, this sounds like a big project that would take a while to program. That being said, I think this would be a great addition to consider after 2.0!