In group settings where you know there are non-meat-eaters or where you aren't sure I'd stick with primal vegetable dishes or make two dishes - one meaty goodness - one green. Are you looking for a hot dish or something cold?
One of my fallback *easy* party trays is a 2lb bag of 30 count cooked and peeled shrimp or bigger (by bigger, of course, I mean a smaller number) with the tail still on. Wrap the shrimp around a fat cherry tomato and jam a toothpick through both to hold them in place. Supply a small bowl of old bay and a small bowl of real butter to be melted.
Sear asparagus drenched in a 50/50 mix of olive oil and butter on the grill. Be sure to include tons of garlic in that fat mixture. Best served hot, but if you sear them so they're still crisp in the middle they are also good cold.