Happens the Sunday of Memorial Day weekend. It's put on by Rhymesayers... the label run by Atmosphere, and has Brother Ali, Freeway, P.O.S., Eyedea and Abilities, etc.
Pretty solid lineup for a local hip hop fest. If the weather is nice that day, the parking could be a nightmare. Because it's done at Canterbury Park horse track, and they get 10,000 people there for live racing on a nice day.