You could ask that everyone come to Thanksgiving dinner dressed as a Pilgrim or Native American. Set realistic expectations. Avoid the Martha Stewart syndrome. Unlike Martha, most of us don't have 50-100 people to help us prepare Thanksgiving dinner. Rather than attempting to replicate her entire magazine menu for the perfect Thanksgiving, just try one or two dishes.
Any recipe looks simple when someone else does all the preparation.
Remember that it is not what you have on your table or how much or little, but who you have around it. A holiday centerpiece may involve filling a basket with colorful fall leaves and acorns or pinecones. Older kids can use hammers to pound the color from leaves onto pieces of muslin cut for a tablecloth or napkins. Involve your kids in the preparation of Thanksgiving dinner. Sure it may take longer, but the time you invest in finding ways for them to participate will only enhance the outcome.