Friends of Posse Grounds artistic rendering of proposed pavilion shell – not actual dome Sedona AZ (August 14, 2012) – On Tuesday, August 14, 2012, at approximately 11:00 in the morning, the dome being constructed for the Posse Grounds Park Pavilion collapsed. The dome will cover the new performance facility at Barbara Antonsen Memorial Park located at Posse Grounds Park in west Sedona....