If you can identify a tree in Arlington that is remarkable for its size, location or history, enter it in Arlington's 1988 Notable Tree Program contest. Winning trees will be announced at Arlington's 1988 Annual Arbor Day Festival on April 23. The contest is intended to help increase awareness and appreciation of Arlington's older trees.

Applications are available at any county recreation center, nature center or branch library. Deadline for application is Tuesday. Call 558-2426 for information.

Also, residents, schools and organizations in Fairfax County who have taken steps toward planting or saving landmark trees or served to educate others about the value of trees in the environment are invited to earn recognition for their efforts and apply to the Fairfax County "Friends of Trees" Award Program.

Awards will be presented to the winners in conjunction with Arbor Day at the Board of Supervisors meeting on April 25. Nominations are due by tomorrow; call 246-3431 to apply.

Do you like to work with people and enjoy taking on a challenge? Volunteer to help a prison inmate or inmate's family make plans for after his release. Offender Aid and Restoration of Fairfax County needs volunteers to work with inmates on a one-to-one basis or in groups as part of an effort to support them on the path to becoming productive citizens.

Also, Family Assistance Program volunteers are needed to provide information and emotional support to families of inmates. Volunteers must be at least 21 and able to make a minimum commitment of four to six hours per month for at least 12 months. Schedule an interview by Monday for the next training sessions, to be held March 12 and 19. Call Helen Broxmeyer at 273-1662.

Area businesswomen are invited to find out how to join the newly formed Burke-West Springfield chapter of the Virginia Federation of Business and Professional Women. The federation is part of a national organization that promotes the interests of working women by elevating employment standards, extending opportunities for career development and providing members with the resources for constructive cooperation and networking. Regular meetings are held on the first Wednesday of each month. For membership information, call 250-7406 or 250-6253.

Instead of paying for someone else to redecorate your home, take a two-part workshop on interior decorating and learn how to do it yourself. The seminar will introduce participants to some of the skills needed to create a well composed scheme. Cost of the seminar is $30 and registration is required by Monday. The seminar will be held from 7 to 9 p.m. March 8 and March 10 at Mount Vernon Recreation Center, 2017 Belle View Blvd., Fairfax. Call 768-3224.

Drop by a giant yard sale to benefit the Easter Seal Society of Virginia on Saturday at George Marshall High School, Leesburg Pike, Falls Church. From 9:30 a.m. to 5 p.m., refreshments and donated household items will be sold by independent Amway distributors. All proceeds will benefit the society. For more information, call 538-4480.

Children ages 3 to 5 can learn how nature changes from winter to spring at "Wake Up, Winter Sleepyheads," a free storytelling hour from 3 to 4 p.m. Sunday at Hidden Oaks Nature Center, 4030 Hummer Rd., Annandale. Stories, songs and puppetry will help understanding of how animals revive after a long winter rest and look forward to the onset of a new season. For more information, call 941-1065.

Audition for the St. Francis' Episcopal Church production of "To Whom It May Concern," an off-Broadway musical, from 7:30 to 10 p.m. tomorrow or from 3 to 6 p.m. Saturday at the church, 9220 Georgetown Pike, Great Falls. The producers are looking for 12 adults and one child 10 to 15 years old for the cast.

Persons auditioning must bring one upbeat piece of music and one ballad. An accompanist will be provided. Performances will be April 22 to 24, 29, 30 and May 1. For directions to the church, call 759-2082. For additional information, call John Hatcher at 437-6530.