Thanksgiving is a celebration of the Earth and the feast is celebrated in November. Thanksgiving is celebrated with the whole family gathered and eat Turkey and are thankful for the day and for each other.
In 2009, when Chloe Armstrong told Eli Wallace that Dr. Inman and her hydroponic team were making strawberries and a soy-protein Eli jokingly said that they would enjoy Tofurkey on Thanksgiving. (SGU: "Space")