Friday Aug 31 is a Blue Moon. This event happens when four full moons are included in one season instead of three. The third full moon is called a “blue” moon.
This event was particularly important in the past since they give the extra work hours needed for the farmers for harvesting during the night.
The moon will not be blue.
Source: SETI
ARYAN'S BLOG 
That’s why a rare occurrence of something is sometimes referred to as being “once in a blue moon.” I think so, anyway. I love tidbits like this. Thanks!