My son's 100th day of school is Wednesday. He's been telling me this for a few weeks now, but I honestly just shrugged it off.
Come to find out, I guess 100 days is a big deal and cause for celebration. There are websites with DIY crafts to commemorate the day http://www.tipjunkie.com/activities-for-kids/100th-day-of-school-ideas/. And, teachers at his campus are dressing up as 100 year olds.
What's your school doing?