There were two different Miami Pop Festival concerts in 1968, separated by seven months. Here we take a look at an original advertising poster from each event. The May festival’s poster prominently features The Jimi Hendrix Experience, and in fact mentions no other bands; this poster was also sold as a souvenir at the fest, probably for just a dollar. And the December shindig is represented by a cardboard concert poster which lists no fewer than 30 artists, including The Grateful Dead, Marvin Gaye and Joni Mitchell. Both are enthusiastically discussed by collector Pete Howard of PosterCentral.com (phone 805-540-0020, email pete@postercentral.com).