I want to know the answer to the following question:
What was the name of the convention where Nintendo unveiled its American version of the Famicom?
All the background I'm provided with is that "Some varieties of these launch games contained Famicom chips with an adapter inside the cartridge so they would play on North American consoles, which is why the title screen of Gyromite has the Famicom title "Robot Gyro" and the title screen of Stack-Up has the Famicom title "Robot Block".". Is that enough to answer the question?
Answer: no