Hi, J.!
I'm a vegan / raw foodie, and there are SO many delicious recipes you can make that are really simple to prepare, and far more filling than the usual veggie tray. :-)
I can give you recipes for things like Black Bean and Mango Salad; Vegetarian/Vegan Chili; Hearty Bean and Vegetable Soup; Carrot, Ginger and Lime Soup; Green Salad (with Red Onion, Pine Nuts and Currants) with Creamy Garlic Blender Dressing; etc.
These dishes are all really delicious, and are all relatively easy to make. (The exception is the Carrot soup; it's easy to make, but involves cracking open a Young Thai Coconut and digging out the meat. Not difficult, but a bit of a hassle!) The salad is delicious with the homemade dressing, which is surprisingly easy to make. You also can't go wrong by serving an appetizer before lunch, and Hummus is a favorite among the veg crowd. I'd recommend picking some up from a good Middle Eastern restaurant rather than the grocery store, though. The cost is not that much higher, but the taste is worlds apart!
You might do something like Hummus to start (with pita bread, and maybe some baby carrots and celery), then serve a small Romaine salad with thinly sliced red onion, pine nuts and currants (you can leave the pine nuts out if there's an allergy issue) and top it with a creamy garlic and citrus blender dressing, and follow it up with the Hearty Bean and Vegetable Soup. Or, if you want to go another route, you could do a live guacamole (so simple and delicious!), followed by a small salad, and an amazing Tortilla Soup. Yummy!
Let me know if you're interested in any of these, and I'll get you the recipes!
Cheers!
S.