The Friends of the Illinois Philharmonic Orchestra will host the annual Rising Star Showcase at 4:30 p.m. on Sunday, April 22, at Flossmoor Community Church, 2218 Hutchison Road in Flossmoor. "We welcome another roster of outstanding performers," said Maryellen Tomassetti, Rising Star Showcase co-chair. "Their musicianship and youth will impress all who hear them." "They'll knock your socks off!" added Friends of the IPO President Dory Machtinger, one of the originators of the showcase. This annual concert offers young musicians the opportunity to showcase their talents and share them with a wider audience . . .