Generally families get together and have a huge meal. It can be formal or informal. People who have to work today will often have office potlucks (a thing where everyone brings a different food item). A lot of people will do Turkey Trots (5k Runs), or attend a parade. My family will have a game night and watch the American football games that are on TV. Black Friday begins this evening, so people may go out shopping. Turkey, Ham, Potatoes, Carrots, Salads, Yams, Corn, etc. are traditional dishes, but a lot families will celebrate with a variety of differing ethnic dishies as well. The holiday is supposed to be about spending time with your family and being thankful for the things you have. It’s not that dissimilar for other meals such as Passover, Novus, Christmas, New Years, etc. Reading the Wikipedia or looking up the history of the day may help you understand more.