From nothing to do, to busy busy busy

At the beginning of every month I check out the calendar and without fail always sigh that there doesn't seem to be MUCH on it besides the norm. Then within just a couple of days I start adding to the calendar for that month and keep adding and adding some more. I'm at the point now that I really can't make appts without having my calendar right in front of me because I will without a doubt double book myself.