Time is very tight. Go with Lesco 28-0-11; fast release is Ok in this situation. It should be green in two weeks. Meanwhile water heavily, take the weeds out and 3 times per week mow a bit shorter...reel mower with sharp blades; collect clipings. Treat it like a baseball field or golf course fairway. Naturally keep it very well-irrigated to stimulate maximum growth and green. Reduce the water about 3 days before the event so that the soil is not soft--but becomes firm enough for foot traffic. High heels are not good on soft soil.
Experiment with liquid chelated iron on your own lawn--if you like the greenish black type of color. Apply to his lawn abut 4 days in advance--quick--but does not last long.