The first CES took place June 25-28, 1967, and I wrote numerous (admittedly similar) pieces about it for:
TWICE – CES Turns 50
Sound & Vision – CES at 50: From Humble Origins to Global Showcase
Dealerscope – CES: The Summer of Love and the First CES
Huffington Post – CES: Previewing the Future for 50 Years
CTA i3 Blog – Happy Birthday, CES!
DTC Digital Riff blog – CES at 50: Lessons Still Not Learned