I second the crockpot idea-- there's almost always a spare outlet somewhere.
If that won't work, a salad I like is potatoes, tuna, finely chopped onion, diced carrot, and peas, with just enough light mayo to bind it. (Mix in the mayo while the potatoes are still warm.) I don't peel the potatoes. Depending on the tastes of the people you're serving, it's even better if you mix crushed garlic in the mayo, or better yet, make your own aiolli.
Slightly weird but usually welcome at a potluck: Roast a turkey (or a chicken for a small group), carve it, and take it along with nice rolls and a selection of spreads and lettuce, etc, for a miniature sandwich bar.
If you take a fruit plate or fruit salad, you can fancy it up by mixing a tiny bit of brown sugar and some grated fresh ginger or lime zest into plain Greek yogurt and setting a bowl of it out with a little ladle as a topping. It tastes a lot like cheesecake but it's low fat and low calorie.
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