Here's my favorite recipe for meatballs for a crowd. They are REALLY good.

Raspberry Enlightenment Meatballs

2 to 3 pounds frozen meatballs
1 jar (9.8 ounces) Penzey's Raspberry Enlightenment Sauce
1/2 of a 52 ounce can of sweet and sour sauce (such as the ones sold at Gordon Food Service)
1 jar (12 ounces) orange marmalade
1 bottle Sara Lee Cranberry Honey mustard
1/2 cup (or to taste) chili garlic sauce

In a slow cooker, place the meatballs. Add all remaining ingredients and stir to combine. Cook on high for 2 hours, reduce the heat and cook until the meatballs are heated through, stirring occasionally

Makes about 90 meatballs
Preparation time: 15 minutes
Total time: 2 hours 15 minutes