Heritage Plaque Unveiling – Sombra Raid of 1838. Heritage St. Clair will unveil its third heritage plaque on Sat. June 25, 2016 at 11 a.m. at Sombra Park on the waterfront in Sombra, Ont. Remarks will be made by Dr. John C. Carter, Ph.D. author of “Piratical Doings on the St. Clair River” (in publication). Inclement weather location is Sombra Museum. Reception and light refreshments to follow at Sombra Museum. All are welcome to attend.