Happy Thanksgiving PowerPoint template is a free PPT template that you can use to download and prepare PowerPoint presentations for free Happy Thanksgiving celebration. This free PPT template for Thanksgiving Day can be used to celebrate Thanksgiving with a nice photo album or story in PowerPoint. When in celebrated Thanksgiving? Thanksgiving is celebrated the fourth Thursday of November in the United States and festivals were held before and after the harvest cycles to give thanks for a good harvest, and to rejoice together after much hard work with the rest of the community. Thanksgiving holiday tradition traces its origins to a 1621 celebration at Plymouth in present-day Massachusetts. There is also evidence for an earlier harvest celebration on the continent by Spanish explorers in Florida during 1565, as well as thanksgiving feasts in the Virginia Colony.