Hi, I'm very glad that you take the time to celebrate a very important holiday here in North America. There is so much information available on the internet that I really don't see it to be problem that you find information on the subject. Nonetheless, here are a few sites that might help you organize your activity.
http://www.mes-english.com/flashcards/thanksgiving.php
http://www.teachchildrenesl.com/filez89 ... hcards.pdf
On these sites you will find some very interesting stuff, mainly flash cards, handouts and games.
Thank you and happy thanksgiving!