Do a Grouch a Favor Day takes place on February 16, 2018. Just do a grouch a favor today, even if you do not like it. A grouch is one who is grumpy or irritable. You can celebrate this day by looking around for someone who is in a grouchy mood. Then you're doing him a favor that will delight his whole day. Maybe the fact of experiencing something good, like a stranger doing him a favor will astonish him so much that will change his behavior in the future.
There are certainly some reasons why your grouch became that way - try to be comprehensive and show him that not everything is a reason to complain. Do a Grouch a Favor Day is the one chance to get in touch. Take a close look and find out what kind of favor is the best for the particular grouch to ungrouch him.