After the shocks come the memorials. When reports swept the Harvard campus Monday afternoon that two bomb blasts at the Boston Marathon had killed and wounded people at the finish line, a wave of sadness and concern swept the campus. That sorrow deepened with the news that a close relative of two Harvard dining staffers, a young woman who also once worked at the University, was among the dead. On Tuesday, Harvard students, faculty, and staff attended three vigils for the bombing victims, in Andover Chapel at the Divinity School, near the Baker Library/Bloomberg Center at the Business School, and at the Memorial Church, where candles undercut the darkness. At each venue, sadness mixed with hope, and tears with resolve.