Thank You Note Day
Thank You Note Day is held on December 26. This event in the third decade of the month December is annual. 
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It’s time to send a Thank you note for those dear ones who have sent you the Christmas gifts. I'm so grateful. I appreciate it. Thanks for your hard work on this. I couldn't have done it without you. I owe you one. Please accept my deepest gratitude.
Thank-you notes not only make the recipient feel good, they can make your gratitude soar as well. Writing a thank you note – or even sending an email – leaves a phenomenal impression, and shows the hiring team that you are grateful for their time and respectful in your approach. Allows you to reiterate why you are the best person for the job. Communicates your enthusiasm for the position. Helps you stand out from your competition. Demonstrates your skills with written communication.
The celebration Day encourages each of us to show our gratitude to one another in possible ways. Though there is no official mention about the reason for this celebration Day, we could think that it falls on this month as lots of gifts are exchanged during the Christmas Festivus.
Similar holidays and events, festivals and interesting facts
Roots Day on December 23
HumanLight Day on December 23 (is a secular holiday that focuses on the "positive, secular human values of reason, compassion, humanity and hope");
Festivus on December 23 (a holiday made popular by the sitcom Seinfeld, as an alternative to the pressures and commercialism of the Christmas season);
Whiner's Day on December 26
Make Cut-out Snowflakes Day on December 27
Card Playing Day on December 28 (Playing cards are thought to have first been introduced to the world in China);
Tick Tock Day on December 29 (urges us to make the most of this time to complete those tasks that can be done in that time)