I have no idea whether tickets remain available.  The following information remains on the website.

More Information
On Saturday, July 18, 2009, the Mateel Community Center invites all to the 25th annual Reggae on the River. Presented as a full day showcase of the best in reggae and world music, the shores of the Eel River at Benbow Lake State Recreation Area will come alive for this silver anniversary celebration with performances by The Mighty Diamonds, Tanya Stephens, The Abyssinians, Etana, Majek Fashek, Queen Omega, Soul Majestic, and Woven Roots, along with vendors, a kid zone, and a great local vibe. For further festival updates, camping information, etc, stay tuned to www.reggaeontheriver.com or call (707) 923-ROTR and don’t miss the 25th anniversary of the one and only Reggae on the River on Saturday, July 18th.