Helen Wennberg announced the engagement of her daughter, Shana Lynn, to David Nystrom, both of Warren. Shana is a 2002 graduate of Chatham University (formerly Chatham College) of Pittsburgh. David is a self-employed contractor working to keep America moving. A sunset ceremony is planned for May in Siesta Key, Fla., with a reception to follow in Venice. A local reception is planned for family and friends in July.