"In the Spring of 1968, the Grateful Dead were finishing recording Anthem Of The Sun. By April, they were working on the final mixdown, so they spent a week in Miami, working at Criteria Studios in Miami. It's not clear if they accomplished anything at Criteria, but they did play seven shows that week, six at Thee Image and one free one at Graynolds Park. This was followed by the Dead's debut at Philadelphia's Electric Factory on April 27 and 28, and then a swing up to New York. 

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              ----The Grateful Dead, Spring 1968