Thanks so much for posting this and helping us get out the word! We are very excited for this once-in-a-lifetime event. Imagine the greatest minds in astronomy -- scientists, philanthropists and institutional partners -- all gathering under the stars in Hawaii to celebrate 20 years of revolutionary science.
Keck Observatory's are the biggest (and most scientifically productive) telescopes on Earth.
From Wikipedia: "...the Gran Canary telescope does not have the capability to use all of its 10.4 meters, thus making the Keck telescopes the largest observable telescope in the world."