There is no other day
Let's try it another way...
Any Little Steven show that begins with the Electric Prunes' "Too Much to Dream" is gonna be great, and sure enuf it's his salute to one of the major components of the Summer of Love, the 14-hour "Technicolor Dream" at London's Alexandra Palais, April 29th 1967. Pink Floyd, among others, performed that day.
TANC yet again. Technicolor Dream was produced in part by Joe Boyd, whose memoirs, White Bicycles, I just finished reading. Extremely interesting read. I knew Boyd as the producer behind Fairport Convention, Richard Thompson, but this book totally opened my eyes to the broad contribution he made to music in the 60s and 70s, mainly as a producer. Prior to working with Fairport et al, he was the stage manager at the Newport Folk Festival in '65, when Dylan went electric. He essentially discovered Pink Floyd, and produced their first single (Arnold Layne). He was the co-promoter of UFO, which was the London equivalent of the Fillmore/Avalon in 67 and 68. He discovered and produced most of the records by the Incredible String Band. He produced Nick Drake's first two albums, which he readily admits no one listened to at the time (partly due to Drake's inability to perform live). He produced REM's Fables of the Reconstruction (their best, imo). And the list goes on.
I happened across my copy of White Bicycles in a bookstore in Bath when I was in the UK last year, but it's since been released in the states. Cannot recommend this strongly enough. It's funny, engaging, and a thoroughly worthwhile read.
http://www.joeboyd.co.uk/index.html