The grape jelly recipe is a standard with many variations, I know it mostly with the little Smokie sausages instead of meatballs, but works either way.
It's just about a cup of grape jelly plus about a cup of BBQ/Chili/Your Favorite Sauce, depends some on what you have on hand. Some people add in other things like Sherry or some extra chili flakes.
I usually look at cooks.com for recipe ideas and blend a few together to get my desired end product. You can just put in your ingredients and see if something comes up, or here's the search for "grape jelly meatballs"
https://www.cooks.com/rec/search?q=g...elly+meatballs
Again, my hubby's non-recipe potluck hit is simply to buy premade/precooked meatballs, and then two large packets of gravy mix, usually country + country sausage pepper. Sort of like the Swedish meatballs but not quite and a lot easier to do then me mixing and cooking for him. Thaw the meatballs the day before the potluck, make the gravy and heat up with the meatballs in a crock pot.