The PGA Championship is August 10th - 16th. They need help starting the week prior (around August 5th/6th) and going through approximately August 19th. There are a range of positions from assisting the merchandise vendors, helping with customer service, to assisting with shipping and receiving. In addition to a uniform, they provide some grounds tickets for the Championship and meals while they are working.
For more information see the PGA Championship Temp Staff advertisement.