Saturday/April 18
Tree Trek. 9:30-11 a.m. at Ellanor C. Lawrence Park, 5040 Walney Road, Chantilly. Jim Dewing will lead a tour of the biggest, oldest and rarest trees in the park. Tickets are $6. Call 703-631-0013.
Earth Day. 11 a.m.-12 p.m. at Ellanor C. Lawrence Park, 5040 Walney Road, Chantilly. Learn about the changing environment and how to recycle household items. Tickets are $5. Call 703-631-0013.
Vinyasa in the Vineyard. 11 a.m. at The Winery at Bull Run, 15950 Lee Highway, Centreville. The Winery at Bull Run is offering a “Stretch & Sip.” Tickets are $15. Visit www.wineryatbullrun.com.
Sunday/April 19
Bluegrass & Barbecue. 11 a.m. The Winery at Bull Run, 15950 Lee Highway, Centreville. Bluegrass bands will accompany barbecue provided by Bad to the Bone. Free. Visit www.wineryatbullrun.com.
Washington Wedding Experience. 11 a.m.-5 p.m. at Dulles Expo Center, 4368 Chantilly Shopping Center, Chantilly. Find fashion shows, vendors, and workshops. $10. Visit www.weddingexperience.com.
Model Train Show. 1-4 p.m. at Fairfax Station Railroad Museum. The Northern Virginia NTRAK Members will hold an N gauge model train show. Admission for museum members is free; $4 for adults 16 and up; $2 for children. Visit www.fairfax-station.org.
Annual 5K and Candlelight Vigil. 4:30 p.m. at 4100 Monument Corner Drive, Fairfax. Find a resource fair, live music, walk, and vigil in honor of crime victims. Free. Visit www.ovc.gov.
Austrian Takeover. 5 p.m. at Trummer’s on Main, 7134 Main St., Clifton. Enjoy wine and food from the Austrian culture by partaking in a wine tasting and five-course Austrian meal. Tickets are $45-135. Visit www.trummersonmain.com/events.