The Diablo Symphony Orchestra will feature highlights from Bizet's "Carmen" as the orchestra completes its 50th season. Also included in the program are Brahms' "Hungarian Dance no.5" and a special treat with the Ritual Fire Dance by De Falla. Performances at 8 p.m. on Friday, May 17 at Rossmoor Fireside Room and at 2 p.m. on Sunday, May 19 at the Lesher Arts Center in Walnut Creek. Tickets are $25 adults and $10 children. Call 943-7469.