I think this is a quite good basic elementary vocab presentation. Key words come from harvest (gather, horn of plenty, sap, maple), autumn (migrate, change color, sweater), the pilgrims (Mayflower, Plymouth colony), traditions (parade, float, balloon, marchning band), and the food (turkey, mashed potatoes, pumpkin pie, stuffing/dressing, gravy, etc). A small section of Thanksgiving riddles (e.g.: What’s the most musical part of a turkey? The drumstick.) The quiz matches pretty closely with the presentation.
I have also attached a presentation about autumn and the handout that goes with it.