Simple, post some of your favorite youtube vids of anything prog related, weither it be live performances, tv appearences, music videos, documentaries or interviews. Just as long as it's awesome... or hilarious.
Gong on some French TV show in 1972. And frontman Daevid Allen (who some of you may know from Soft Machine) is tripping mad f*cking balls on some kind of acid. The craziness starts at 2:35.
Jethro Tull in 1977. Ian Anderson being his typically goofy self.
Gentle Giant in 1974. Keep an eye on the drummer.