Sprint’s having a pretty major launch party for their new 4G network and its flagship 4G phone, the HTC/Sprint EVO.

The event will take place on May 12th and will include cocktails, hors d’oeuvres and a private, advanced screening of Walt Disney Pictures’ summer blockbuster, Prince of Persia: the Sands of Time, before its Memorial Day release.

Not sure yet how the pre-screening will actually tie into the marketing of the phone yet, but with 4G speeds and an available HDMI port on the phone, it’s capable of some pretty hi-def content.  Wouldn’t surprise me if Sprint customers with an EVO 4G phone get some exclusive Prince of Persia content for having one, or for those who attend the event.