A gluten free/vegan friend came to visit for a long weekend last month. I kind of panicked at the thought of figuring out gluten free/vegan foods for a whole weekend, but here's what I served:
Dinner:
"haystacks" - basically a Chipotle "bowl" - beans, rice, lettuce, tomatoes, onions, salsa, cheese, sour cream (but most vegans I know just leave the cheese & sour cream off). You could do fajita veggies like Chipotle does too. Set everything up buffet style in separate bowls and each person "builds their haystack" they way they want.
Baked potatoes with salsa &/or marinara sauce and steamed broccoli (could include other steamed veggies, but dh is picky, so it's easier to just do broccoli since we all like it)
Crockpot red lentil curry over rice -
http://pinchofyum.com/crockpot-red-lentil-curry
Grilled out one night - veggie kabobs, corn on the cob and pineapple (marinade pineapple chunks in lemon juice & honey, then grill on the kabobs or a separate kabob)
Breakfasts - I just did oatmeal. She had some gluten free English muffins she brought with her.
Lunch:
We took a picnic lunch the day we were "sight-seeing". I made "black bean salsa" (black beans, corn, chopped bell pepper &/or tomatoes, chopped onion, chopped cilantro, season with salt, pepper, jalapeno if you like things spicy, a little lemon or lime juice) served with tortilla chips, and then had raw veggies and some kind of fruit as sides.
Hummus platter - hummus, raw veggies, chopped olives, feta cheese (for the non-vegans). We usually eat it with tortilla triangles, but can just dip the raw veggies in the hummus if gluten-free.
Our 3rd lunch we ended up just doing leftovers because there were lots, but my plan was to do fried rice for that lunch
Honestly it wasn't as hard as I thought it would be (we're vegetarian, but not vegan or gluten free), and my biggest challenge was dh's pickiness