I usually serve this with some pasta with the remaining juices - you could always just add your shrimp at the end and have your shrimp in the pasta.
I love to grill (or bake) baguette slices until crisp and slather with goat cheese then top with homemade pesto and slivers of freshly roasted red, yellow, and orange peppers as an appetizer. For a large gathering one time I just combined all of these things in a food processor for people to slather on the baguette so they wouldn't have to "construct" each one.
But it sounds like you could have absolutely anything as the focus is going to be on your wonderful friendship.
You could do a court boullion fondu style dinner - have the broth one to cook your shrimp and chicken in also to cook some sliced mushrooms, sliced zucchini, sliced onion, etc. - have a cheesey one to dip your veggies/bread in - and then a chocolate one for dessert. You just sit around and talk and chat and eat at your own pace and everything stays hot at the same time.
One thing I do love making with a group of people is summer/spring rolls. The ones using rice paper, I use shrimp, cilantro, lime, peppers, carrots, cucumber (all julienned in long pieces), rice stick noodles and make a sauce with fish sauce and rice vinegar, garlic chili paste or chili flakes and another one with fish sauce, rice vinegar, lime juice, soy sauce, and peanut butter. These would make great appetizers.