S.B.
I love the brocolli salad from Costco - it is so good and people love it. Costco also has huge containers for salad - spinach and mixed greens. I ususally mix them together and add some tomatoes and cucumbers with dressing on the sides.
Sprouts has some great sales on strawberries, blue berries and blackberries - depending on the date. Last week they had 4 containers for $5!! Sam's usually has good prices on strawberries.
I do like the idea of people bringing appetizers and or dessert for more variety.
Good luck and congratulations!!