Make ahead tips: The Halloween Party Mix stores well up to three days in an air-tight container. You can also make the Black Bean Dip with Baby Carrots up to two days ahead. Cover tightly and refrigerate. You can make the salad components the day before. Whisk together the dressing and wash and dry the greens and tomatoes. Store the veggies and dressing seperately and toss just before serving. Shake the dressing to combine well.