The Summer Spirit Festival, which was to be headlined by Nas and Damian Marley, has been cancelled. The one-day event was scheduled to take place at Merriweather Post Pavilion August 14. Common and Erykah Badu performed at the festival last year. This year, Chuck Brown and the Roots had been announced to join Nas and Marley. The festival had been advertised since June. The cancellation was quietly announced a week or two ago, a spokeswoman for Merriweather Post Pavilion said. A reader noticed the cancellation on the venue's website today. Tickets, which started at $44, are refundable up to the day of the show whereever the tickets were purchased, according to a note on Merriweather's website.