In what some are calling an opportunity to foster racial healing and reconciliation, Gainesville elected officials will join with members of local churches and civic organizations Sunday to dedicate a memorial garden where more than 1,100 African-Americans are buried in unmarked graves. The highlight of a short dedication ceremony that begins at 2 p.m. Sunday will be the unveiling of a 7-foot tall black granite monument anchoring the memorial garden between sections 16 and 17 at the city-owned Alta Vista Cemetery where most of the unmarked graves rest.