Don't know if these will help, as they are all served hot except the Coronation Chicken, but these are my top 5-10 potluck dishes:
1. Scalloped Potatoes (from Canadian Living)
6 potatoes (about 2 lb/1 kg)
1 onion, sliced
1/4 cup butter
1/4 cup all-purpose flour
salt & pepper to taste
1/2 tsp thyme or marjoram
2-1/2 cups milk
Sauce: In saucepan, melt butter over medium heat. Add flour, salt, pepper and thyme; cook, stirring, for 1 minute. Gradually whisk in milk; cook, whisking constantly, until boiling and thickened, 5 to 8 minutes. Set aside.
Casserole: Peel and thinly slice potatoes. Layer one-third in greased 8-inch (2 L) square glass baking dish or casserole; spread half of the onions over top. Repeat layers. Arrange remaining potatoes over top. Pour sauce over top, using tip of knife to ease sauce between layers.
Cover and bake in 350 F (180 C) oven for 1 hour. Uncover and bake until lightly browned and potatoes are tender, about 30 minutes longer. Let stand for 5 minutes before serving.
2. Au Gratin Potatoes
Same as Scalloped Potatoes, except add 1/2 cup grated sharp cheddar cheese and 1/8 cup grated Parmesan to sauce.
3. Tamale Rice Dish (from Company's Coming One Dish Meals)
1 lb ground beef
onions, garlic, green pepper chopped
2 14 oz cans stewed tomatoes
1 cup frozen corn
1 envelope taco seasoning (I use 1 tbsp Epicure Taco Seasoning)
1 tbsp honey
Chili powder and cumin to taste
1/2 cup water
2/3 cup white or brown rice
Brown ground beef and chopped veggies, add remaining ingredients, simmer until rice is cooked, pour into casserole dish.
Sprinkle with 1/2 cup grated cheese, dab with sour cream, sprinkle with olives and serve with plain nacho chips.
4. Coronation Chicken (from Once a Month Cooking Family Favourites)
2 boneless skinless chicken breasts, cooked and cubed
1/2 cup golden raisins
2/3 cup mayonnaise
1 tsp curry powder
1 tbsp mango chutney
1 tsp lemon juice
salt & pepper to taste
2/3 cup toasted cashews
1 large mango, sliced
Mix raisins, mayo, curry, chutney, lemon juice, salt & pepper, and half the nuts together in medium bowl, toss chicken with dressing, spoon atop lettuce or other salad greens on plate, garnish with remaining nuts and mango slices, serve cold.
5. Chicken Taco Bake
1 lb ground chicken or turkey
1 onion, chopped
1 tbsp taco seasoning
1 500 ml jar salsa
1 pint canned black, pinto, or red kidney beans
salt & pepper to taste
1 bag plain nacho chips
1 cup grated cheddar cheese
Brown chicken/turkey with onion, add half the salsa, the beans, and seasonings. Turn into 9x13 baking dish lined with nacho chips, sprinkle more nachos and cheese over top and bake till cheese is melty.
Thanks though. 
