The only things I have thought of otherwise are a smoked trout spread or ceviche
Any suggestions would be appreciated!
You did not mention where you were located but here in the Houston area the weather is still cool enuf for warmish soup shooters.
Lobster (shrimp, crawfish, crab) bisque is always a hit plus it is pretty on the tray.
Keep the cream warm and add just before plating.
edit for spell check
the following suggestions can be served cold
tuna loin seasoned with gomasio and szechuan peppercorns, seared rare and sliced, on a daikon radish coin place a bed of seaweed sesame salad, then the tuna slice, top with a fermented black bean sauce and pickled ginger
scallops poached in a spicy coconut broth, in a tasting spoon put a bed of seared baby bok choy and napa cabbage, then pour in some of the coconut broth, place the scallop and top with a banana galangal chutney
brush shrimp with a honey lime glaze and grill, in a won ton cup put some curried mango sorbet, top with shrimp and sprinkle with micro mint
here cold recipes I love http://www.epicurious.com/recipes/food/views/caviar-eggs-350244 Caviar eggs and Smoked trout & radish remoulade tartines http://www.bbcgoodfood.com/recipes/smoked-trout-radish-remoulade-tartines In case you need seafood delivery https://globalseafoods.com/collections