The May event was officially publicized on promotional materials and in radio ads as the " 1968 Pop and Underground Festival , " and " The 1968 Pop Festival " . An estimated 25,000 people attended this event , which was promoted by Richard O'Barry and Michael Lang . Bands featured at the festival included The Jimi Hendrix Experience , The Mothers of Invention , Blue Cheer , Chuck Berry , John Lee Hooker , The Crazy World of Arthur Brown , Blues Image , Charles Austin Group , and Evil . The opening act on Saturday was a little-known group called The Package , and the closing act was The Jimi Hendrix Experience . The second part of what was originally scheduled as a two-day event , Sunday 's concert was rained out , but there was at least one beneficial result — it inspired Hendrix to write " Rainy Day , Dream Away . " Decades later , the festival began to be referred to colloquially as the " Miami Pop Festival " , leading to confusion with the actual Miami Pop Festival , which took place in December 1968
Miami Pop Festival
Miami Pop Festival (December 1968)
Miami Pop Festival (May 1968)