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TRIBUTE TO MANDELA: We Are Women Warriors will present a tribute to Nelson Mandela at 5:30 p.m. Wednesday at the Frank E. Merriweather Library, 1324 Jefferson Ave, Buffalo. For more information, call 894-0914.

TREE OF LIFE: True Bethel Baptist Church will hold the 10th annual Tree of Life for Friends and Families of Homicide from 5:30 to 7 p.m. Thursday at 907 East Ferry St., Buffalo. For more information, call 894-0814.

Christmas concert: First Presbyterian Church will hold its Christmas Carol Candlelight Concert at 7 p.m. Sunday at 100 Church St., Youngstown. Featured will be the Senior Choir; the Church Street Singers, which is a guitar group; and the Children’s Choir of the church. There is no charge; free will offerings will be accepted.

Technology CLASS FOR ADULTS: The Kenilworth Branch Library, 318 Montrose Ave., will present a technology class for adults, “iPad Basics,” from 1 to 3 p.m. Dec. 30. Students must bring their iPad as well as their Apple IDs and passwords. Space is limited. Registration is required; call 834-7657.