Boss's Day is a secular holiday celebrated on October 16 (or the nearest working day) in the United States, Canada, Lithuania and Romania. It has traditionally been a day for employees to thank their bosses for being kind and fair throughout the year. This day was created for the purpose of strengthening the bond between employer and employee. Although the holiday is still controversial, it has become increasingly popular since its creation.
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All details taken directly from provider content at http://en.wikipedia.org/wiki/Boss's_Day