I might celebrate it (well, cook a meal at least). I think it's about thanking the native Americans. This is what I know about the traditional meal:
Mashed potatoes (unless creamed means something else)
Sweetcorn (on the cob?)
Sounds a bit unexciting actually - do you have any traditional alternatives? I don't think I'd like that for a Sunday lunch :/
How about this:
Roast chicken, roast potatoes, and something green, like cabbage. And a nice gravy.