Mix together chicken, grapes, nuts and celery.
Mix 1/2 - 1 cup mayo with a squirt of lemon juice. Mix until creamy - adding more of either ingredient until it is the consistancy of a light dressing.
Note: You can also roast chicken breasts/thighs. Sprinkle with your favorite seasonings, place in baking dish, add a 1/4 cup water, cover with foil and back 20-30 minutes.
Another option is to use Rotisserie Chicken.