Entertainment Roundup Pianist Byron Janis Will Play At RMHS American pianist Byron Janis will open the National Sym phony Orchestra’s Montgomery County series Dec. 5 at 8:30 p.m. in Richard Montgomery High School, with Howard Mitchel conducting. Returning as soloist with the National Symphony for the first time since January, 1962, Janis will play Prokofieff’s Concerto No. 3, which won him the con gratulations of the composer’s widow when he performed the piece in the Soviet Union earlier this year. Series tickets priced at $5.50, $7.50 and $3.25 (students) and single tickets at $3, $2.25 and $1.35 (students) are on sale at The Surrey in Potomac and at the Music and Arts Center, Inc., Rockville and Bethesda and at the National Symphony box office, 1108 G St., N.W. Community Orchestra The Kensington Wheaton Community Symphony Orches tra, directed by John Stephens, will present its first concert Dec. 8 at 5:30 p.m. in Albert Einstein High School, Kensing ton. Tickets are on sale at $1 for adults and 50 cents per student and may be obtained from area merchants. Program for the concert will Include overture music for the Royal Fireworks by Handel, “Come Autumn Time,” by Leo Sowerby, and Bacchanale from “Samson and Delilah" by Saint- Saens. The new orchestra, number ing over 75 performers, will pre sent four regular concerts this season. In addition, the Mary land National Capital Park and Planning Commission has ex tended an invitation to present a Summer Series in Wheaton Regional Park. Shoreham Flamenco Castanets, guitars and Fla menco music enlivens The Shoreham Blue Room from Dec. 3-14 when Jose Molina presents his Bailes Espanoles. Showtime Tuesday through Thursday is fKvcicicmtctcictp