BlackBerry Jam Asia 2013 is set to take place in Hong Kong on September 26-27 and just like all Jam events before it, if you're a developer attending the event you can qualify to get your own free BlackBerry 10 Dev Alpha C device just for attending:
To help prepare for the next wave of mobile users, qualified developers at BlackBerry Jam Asia could receive a BlackBerry 10 Dev Alpha C device at the conference! The BlackBerry 10 Dev Alpha C is a testing device for developers that can be used to help adjust, debug and test BlackBerry 10 apps for BlackBerry 10 QWERTY smartphones, such as the BlackBerry Q10 smartphone, as well as the new BlackBerry Q5 smartphone.
Entry is easy enough, just register for the event as a developer, fill out the requested information and attend the event. BlackBerry will handle the eligibility part but as long as you nor your company have previously received a Dev Alpha device at a BlackBerry event or directly from BlackBerry, your chances of qualifying are pretty good.