Cat adoption day, sponsored by the Homeless Animals Rescue Team. Volunteers 13 and older (those 15 and younger must be accompanied by an adult) are needed to hold cats. Noon-3 p.m., Sterling Petsmart, 46220 Potomac Run Plaza, Sterling. 703-444-6500 or www.hart90.org.
Dulles Knitting Group, knitters of all skill levels are welcome 1:30-3 p.m., upstairs at Wegmans, 45131 Columbia Pl., Sterling. Free. 703-724-4210.
Toastmasters Club, NOVA Dawn Breakers. 7:30-8:30 a.m, Eggspectation restaurant, 1609 Village Market Blvd., Leesburg. 703-608-2286 or email@example.com.
Sewing and “stitch-in,” for beginners. Take sewing, knitting, needlepoint or crochet projects. Machines provided. 9-11:45 a.m., Leesburg Senior Center, 102 North St., Leesburg. Free. 703-737-8039.
Mah-jongg, Chinese tile game. At noon Mondays and Thursdays, Leesburg Senior Center, 102 North St., Leesburg. Free. 703-737-8039.
Sterling Rotary Club meeting, 12:30 p.m., Logan’s Roadhouse, 46321 McClellan Way, Sterling. 703-401-4509.
Line dancing for seniors, age 55 and older. 2-3 p.m., Carver Center, 200 Willie Palmer Way, Purcellville. $2. 571-258-3400.
Rotary Club of Leesburg Daybreak, 7:30 a.m., Tuscarora Mill restaurant, 203 Harrison St. SE, Leesburg. 703-622-4320 or www.leesburgdaybreak.org.
DAR meeting, with a presentation by Jay Hall Carpenter, a sculptor who designed and started work on the Revolutionary War statue on the Leesburg Courthouse Grounds. 11 a.m., Harmony Hall, 39071 E. Colonial Hwy., Hamilton. Free. 540-882-3596.
Party bridge, 1-4 p.m., Leesburg Senior Center, 102 North St., Leesburg. Free. 703-737-8039.
Poker, age 55 and older. 1:30-4 p.m. Tuesdays and Thursdays, Senior Center at Cascades, 21060 Whitfield Pl., Potomac Falls. $1; center members, free. 571-258-3280.
Bluegrass and folk jam, open to musicians of all skill levels. 7-8:30 p.m., Morningside House, 316 Harrison St. SE, Leesburg. Free. 571-237-2888.
“Natural History of Owls,” an illustrated slide show by Paul Engman, past president of the Raptor Society of Washington. Sponsored by Loudoun Wildlife Conservancy. 7 p.m., Historic Morven Park, 17263 Southern Planter Lane, Leesburg. Free; registration required. 540-554-2542, www.loudounwildlife.org or firstname.lastname@example.org.
Book discussion, Call for titles. 10 a.m. second Wednesdays, Leesburg Senior Center, 102 North St., Leesburg. 703-737-8039.
Waterford Quilters, new members are welcome. 10 a.m. second Wednesdays, Waterford Old School, 40222 Fairfax St., Waterford. Free. 540-751-0749 or email@example.com.
Middleburg duplicate bridge, open game. 12:30 p.m., Emmanuel Episcopal Church, 105 E. Washington St., Middleburg. $5. 540-687-5093.
Ashburn Toastmasters, for those interested in developing leadership skills. 7:15 p.m. second and fourth Wednesdays, Broadlands Community Center, 43008 Waxpool Rd., Ashburn. 703-795-9324 or www.
“Start Your Business,” seminar sponsored by the Loudoun Small Business Development Center. 11 a.m.-1:30 p.m., Mason Enterprise Center, 202 Church St. SE, Leesburg. $10 for online registration; at the door, $15. 703-430-7222 or www.
Rotary Club of Ashburn, noon,
1757 Golf Club, 45120 Waxpool Rd., Dulles. 703-969-3070 or www.
Pinochle, 12:30 p.m., Leesburg Senior Center, 102 North St., Leesburg. Nonmembers, $2. 703-737-8039.
“Champion Trees: What Makes a Champion?,” discussed by Joe Howard, sponsored by the Loudoun County Master Gardeners. 7 p.m., Rust Library, 380 Old Waterford Rd., Leesburg. Free. 703-777-0373 or www.loudouncountymastergardeners.
Sterling Ruritan Club bingo,each game has a prize of at least $100; admission is restricted to paying participants. Benefits Ruritan Club civic organization area programs. 7 p.m., Sterling Ruritan Club, 183 Ruritan Rd. Admission, $15 for six regular cards; additional cards may be purchased. 703-444-6039.
Countryside Women’s Club, meeting and social, with a guest speaker. 9:30 a.m., Countryside Women’s Club, 46020 Algonkian Pkwy., Sterling. Free. 703-430-6505 or firstname.lastname@example.org.
Knitting and crocheting, 10 a.m.-noon, Senior Center at Cascades, 21060 Whitfield Pl., Potomac Falls. Free. 571-258-3280.
Leesburg Senior Center bingo, 12:45 p.m., Leesburg Senior Center, 102 North St. 50 cents per card. 703-737-8039.
Birding at Banshee, monthly bird walk, sponsored by the Loudoun Wildlife Conservancy and Friends of Banshee Reeks. Take binoculars. 8 a.m., Banshee Reeks Nature Preserve, 21085 The Woods Road, Leesburg. Free. 540-554-2542 or email@example.com.
Super Science Saturday: “From The Wright Brothers to the Right Stuff,” with demonstrations and hands-on activities. 10 a.m.-3 p.m., National Air and Space Museum, Steven F. Udvar-Hazy Center, 14390 Air and Space Museum Pkwy., Chantilly. Free admission. 202-633-1000 or www.nasm.si.edu/events/
150th anniversary of the Loudoun Heights Raid, with a program by Eric Buckland and Robert H. Moore II. Participants will caravan to the site of Cole’s cavalry encampment and headquarters after the program. Lunch will be sold at the church. Sponsored by the Mosby Heritage Area Association. 11 a.m., Christian Community Church, 12623 Harpers Ferry Rd., Purcellville. $10; students, $5. 540-687-6681 or www.
Lucketts Bluegrass, music by Springfield Exit, with Linda Lay, David Lay and David McLaughlin, Tom Adams and Marshall Wilborn. Food sold. Doors open at 6 p.m.; music begins at 7. Lucketts Community Center, 42361 Lucketts Rd., Leesburg. $15. 703-771-5281 or www.luckettsbluegrass.com.
Celtic jam session, refreshments sold by Hill High Orchard. 1-4 p.m., Round Hill Arts Center, 35246 Harry F. Byrd Hwy., Round Hill Requested donation, $5. 540-338-5022 or www.roundhillartscenter.org.
Mail: Community Events, Loudoun Living, The Washington Post, 104 Dry Mill Rd., Suite 101, Leesburg, Va. 20175
Details: Announcements are accepted on a space-available basis from nonprofit and public organizations and must be received at least 14 days before the publication date. Include event name, dates, times, exact address, prices and a publishable contact phone number.