TMSC International® Management & Leadership: Happy Halloween, Happy All Saints Day, & Happy All Souls Day!!!!! Posted on October 11, 2010 by tresmaliscott The holidays are a great way to improve employee relationships. Use the “Holidays” to your company’s advantage. The History: Halloween comes from the Celtic festival of Samhain and the Christian “All Saints Day”. Tell Co-Workers & Colleague On:EmailTwitterFacebookRedditPrintPinterestTumblrLinkedInLike Loading...