Hey SK! You could also do a cold bruschetta. Toast the bread pieces and make the topping. Port to the party separately and then assemble when you get there.

I also like the idea of the tomato salad with the mozzarella and fresh basil. Just make sure you use fresh mozzarella, not the kind in plastic wrapping. Here's a link to a recipe I am planning on doing soon for heirloom tomato salad:

http://www.epicurious.com/recipes/re...s/views/235735