The 4-hour hands-on workshop (1-5pm on Sunday August 15) is only $40.00 and it'll be held at Site 3 coLaboratory. You can bring your own original Game Boy and flash cartridge, or borrow one from the instructors. You can even buy yourself a shiny new (old) Game Boy!
If you're interested in getting the tickets online, head here.
And if you want a better idea of what you're getting yourself into, check out Jeff's live act: