Would creating an "Appreciation Day" make the world a better place?

I try to live my life letting people know I appreciate them and thanking them but it has often been awkward.

Could we overcome the cultural awkwardness by having a holiday where it is permissible to drop a note to anyone who has impacted your life for the better- letting them know how and thanking them?

Without a holiday to allow it, people assume you are coming on to them, a stalker, dying, suicidal or think they are. Would a holiday allow us to celebrate each other without worrying that it have a darker underlying meaning?