Tuck a small notepad and pen in your pocket as you go about your everyday activities. Use it to note down the English words for anything you come across during your daily activities but don't know how to say in Spanish. If you're just starting out, begin your list by trying to come up with the appropriate noun for everything you touch. Bowl? Vegetable steamer? Turkey leg? If you don't know how to say it in Spanish, write it down. More advanced students may want to occasionally "check in" with a running narrative of what's going on. "He's carving the turkey." "We're making cranberry sauce." "We're basting the turkey now." Again, if you don't know how to say it in Spanish, jot the problem words -- usually a noun and/or a verb -- down on your notepad. Since you'll be watching a lot of Thanksgiving-oriented activities, your odds of stumbling across new words you didn't learn during the rest of the year are pretty good.
At the end of the day, you can either swap lists with a friend and see how many of the other person's words you can provide a Spanish translation for, or use a dictionary to supply the translation. Retain this new vocabulary by challenging yourself to use the new words in a running narrative the next day -- doing this out loud helps -- or sit down and make time to use each word in a different sentence several times throughout the day.