Extra credit for no fussy ingredients and appeals to a wide variety of folks...
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Trena is a trusted source on general cooking.
Here are my suggestions:
pierino is a trusted source on General Cooking and Tough Love.
Pigs in a blanket are a throwback but certainly unfussy.
Certainly not trendy but these have been included in my Christmas Eve family buffet menu for 30 years and are always a favorite, especially if children involved.
I like pretzels with a mustard-butter-spice sauce, baked in the oven. You can basically take a party mix recipe and turn it into a mustard-nuts-cereal base. The spices (warm with chili) are pretty autumnal to me.
From backyard BBQs to beach picnics.
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