Will as the Grammar Police
It seems that in addition to reading, Will has taken it upon himself to correct grammar. One day, after I picked him up from school early, we went back to my office so that I could wrap up some work. I gave him my calendar and my markers. He did some normal things, such as drawing a picture of him and Alex celebrating Thanksgiving on Thanksgiving and he wrote the month numbers on the little months at the bottom of the calendar. I'm not sure why it looks like July and August are exploding with blue suns, but I'm sure there is a reason. He also wrote "Dec" in green after the last day of November on the calendar grid. So I think it's safe to say he understands calendars and dates.
The remaining question is, "What are all of those orange lines?"
If you look closely, you will see that they all originate from the text "with 's"
The original one points to the 29th where I had written "Read Will Class" My intention was basically "Read - Will's Class" I also had "Read Alex Class." Will decided that it should be, "Read with Will's Class" and "Read with Alex's Class" so he wrote the "with 's" and drew lines to every calendar event where the reading events were mis-labeled.
The end result - when I look at my calendar and realize it is the day to go listen to Will and his classmates or Alex and his classmates read to me, I get the message grammatically.