This week there are two dates that have multiple cool things going on. The two dates are both multiples of three: 9/21/15 and 9/24/15.

Monday, 9/21/15 is also the month’s half-back day – go up 12 from 9 to 21 and then come back halfway (6) to 15.

And, Thursday, 9/24/15, is a Minus Subtract day, because 9 – 14 = -15