March 1st - March 7th
National Write a Letter of Appreciation Week is celebrated every year on March 1 to 7. As social media and technology grow as a quicker and more effective means of communication, handwritten notes appear to be a dying art. National Write a Letter of Appreciation Week encourages people to write a personal message, mail it, and express gratitude to those who have influenced their life.
Source: www.indeed.com/hire/c/info/samples-of-appreciation-letters