A memorial service for Mary Spink, the local activist who died on Jan. 16 at the age of 64, will be held this Sunday at 5:30 p.m. at Cooper Union on East Seventh Street and Third Avenue. In an e-mail to The Local, Rona Clemente, the acting executive director of the Lower East Side People’s Mutual Housing Association, wrote, “We are extending an invitation to the entire Lower East Side to join friends and colleagues at the memorial service.”