CEDAR RAPIDS — The Sisters of Mercy Community in Cedar Rapids is celebrating the more than 500 collective years of service among nine of their nuns.On June 9, from 2:30 to 4 p.m., public jubilee celebrations will be held in Cedar Rapids for the seven sisters.The Sisters of Mercy celebrating jubilees include:Sister Mary Corkery — 75 yearsCorkery was born in Sumner and went to college at St.