Sts. Sahag and Mesrob Church of Providence, RI, will host a presentation on the new book by musicologist Margarit Rukhkyan: The World of Konstantin Petrossian, on the life and work of the Armenian composer and conductor. The event will be held on Friday, Sep. 20, at 7 p.m., at the church (70 Jefferson St., Providence). Sponsored by the parish Cultural Committee. Admission is free; reception and book signing to follow. Click to the parish website for information, or click here to view a flyer.