Sides are the unsung heroes of the BBQ spread. Bright, refreshing, and veggie-packed, they balance out the richness of those ribs, burgers, and sausages. They also meet our (strict) potluck-dish criteria: They feed a crowd, travel nicely, and can be made in advance. Here’s our take on four beloved classics—a chickpea salad with herbs, sweet roasted peppers, and bright red wine vinegar; mustardy potato salad with crisp green beans; crunchy sesame slaw; and grilled corn salad with lots of lime and cilantro.