Visit the Grand Hustle website online. Although you can call the headquarters to ask about booking, you'll be redirected to the online portal.
Click on the Booking tab, which will take you to another page. Here, you'll find a request form that you must fill out and submit.
Fill in each field of the form according to the instructions. Be sure to print a copy of the form for your records. When you're done, submit it and wait to be contacted by the record label's booking manager.