“Hansel and Gretel,” an opera by Engelbert Humperdinck, will be performed by the Judson College Delta Psi chapter of Delta Omicron International Music Fraternity on April 14 at 7 p.m. A special performance for area schoolchildren will be given April 15 at 10 a.m.  Both performances will be in Alumnae Auditorium. Based on the Brothers Grimm fairy tale, the opera…