A cool pasta salad is always good with BBQ - I’m pretty basic with rotini, diced red & yellow pepper, green onions (or red diced small), sliced black olives, chopped sun-dried tomatoes, zesty italian salad dressing mix and bottled creamy italian salad dressing. Let it sit overnight -yum. Sometimes, if in the mood, quarter pepperoni slices and throw in as well.
Or, some nice tomato caprice skewers, easy to make quickly.