The Friends of the Arlington Public Library will hold its fall book sale at Central Library, 1015 N. Quincy St., from Oct. 4-6. There is no admission. Call 703-228-5990 for details.
The Northern Virginia Park Authority is seeking volunteers to don work gloves on National Public Lands Day, Saturday, Sept. 28, from 8:45 a.m.-1 p.m. at Upton Hill Regional Park, at the intersection of Patrick Henry Drive and Wilson Boulevard at 6060 Wilson Blvd., near Seven Corners. Call Joe Zilincar at the Bureau of Land Management at 703-440-1717. Complimentary beverages and lunch will be provided at the site.
Volunteers are also needed to plant a butterfly garden at the Washington & Old Dominion Trail’s new western Arlington way station, between Lee Highway and Little Falls Road. Call to register in advance at 703-276-1220 or email wodtrail@erols.com.
“Paws for a Cause” will be held Sunday, Sept. 29, from 1-5 p.m. in the plaza at Pentagon Row, located at the corner of Army Navy Drive and South Joyce Street. Festivities will include a gala parade of pets, a pet beauty contest, pet talent contest and more. Registration begins at 1 p.m. and judging will take place at 2 p.m. Ten percent of receipts dated Sept. 29 brought to the plaza will go toward the Animal Welfare League of Arlington. Call 703-931-9241. Visit http://www.AWLA. org.
Potomac Overlook Regional Park, 2845 N. Marcey Road, will hold a free renewable energy program, “Let the Sun Shine In!” on Sunday, Sept. 29, at 2 p.m., for adults and children age 8 and above. Pedal an energy cycle, wire circuits on a solar electricity system and cook with sun power. These experiences and more provide hands-on learning oppor- tunities. Reservations are required. Call 703-529-5406.