Outpatient addiction services Group counseling for people with mental health and substance-abuse issues. Montgomery County Department of Health and Human Services, Adult Behavioral Health Services, 981 Rollins Ave., Rockville. 240-777-1680. www.montgomerycountymd.gov/HHS.

Volunteers needed To lead “Bone Builders” exercise classes intended to help prevent falls and fractures caused by osteoporosis. Montgomery County Department of Health and Human Services. 240-777-3043. dawn.praske@montgomerycountymd.gov.

Tai chi meditative exercise Thursday at 10:30 a.m. Ross J. Boddy Community Center, 18529 Brooke Rd., Sandy Spring. 301-774-8881. Free. Registration required.

“Managing Heart Disease” workshop A presentation by Suburban Hospital cardiologist Daniel Schwartz. Thursday at 1:15 p.m. Holiday Park Senior Center, 3950 Ferrara Dr., Wheaton. 240-777-4999. Free. Registration required.

Ocular health workshop A presentation by ophthalmologist Toufic Melki of the Retina Centers of Washington. Free glaucoma screenings will follow. Sponsored by the Prevention of Blindness Society. Thursday at 1:30 p.m. The Village at Rockville, 9701 Veirs Dr., Rockville. 301-354-8447. www.thevillageatrockville.org. Free. Registration required.

“Sight Matters” workshops Presentations on eyesight deterioration, with hands-on demonstrations, exhibits and door prizes. Sponsored by the American Health Assistance Foundation and Asbury Methodist Village. Friday at 1:30 p.m. Asbury Methodist Village’s Rosborough Cultural Arts and Wellness Center, 409 Russell Ave., Gaithersburg. 301-556-9368. www.ahaf.org/SightMatters. Free.

‘Ladies’ Hike Out’ nature event A Brookside Gardens-hosted walk along a Blockhouse Point Conservation Park trail to a Potomac River overlook. Saturday at 9 a.m. Call 301-962-1480 for meeting location. Free. Registration required.

Rockville blood drives Monday and Tuesday, 10 a.m.-4 p.m. Montgomery College, 51 Mannakee St., Rockville. 800-733-2767. www.redcrossblood.org. Appointments recommended.

Physical therapy seminar A presentation by rehabilitation specialist Linda Kuserk on “Exercise Therapy and What It Can Do.” Monday, 1:15-2:15 p.m. Holiday Park Senior Center, 3950 Ferrara Dr., Wheaton. 240-777-4999. Free.

“Bone Builders” classes Exercises intended to improve balance and increase bone density. Mondays and Wednesdays at 3 p.m. Potomac Library, 10101 Glenolden Dr. 240-777-1350. Free.

Adventist HealthCare Walking Club Tuesday at 8 a.m. Westfield Montgomery Shopping Mall, 7101 Democracy Blvd., Bethesda. 301-469-6000.

“Better Bones” movement classes Exercises to help improve strength and balance. Much of the regimen can be followed while seated. Tuesdays and Thursdays at 10:15 a.m. and 2:15 p.m. Holy Cross Hospital Senior Source, 8580 Second Ave., Silver Spring. 301-754-8800. Free. Registration requested.

Bethesda blood drive Tuesday, 1-7 p.m. Pilgrim Lutheran Church, 5500 Massachusetts Ave., Bethesda. 800-733-2767. www.redcrossblood.org. Appointments recommended.

Silver Spring blood drive Wednesday, 1:30-8 p.m. Montgomery County Chapter House, 2020 East West Hwy., Silver Spring. 800-733-2767. www.redcrossblood.org. Appointments recommended.

Yoga class registration An eight-session course led by Sandi Rothwell. Wednesdays (Feb. 20 to April 10) at 12:45 or 2 p.m. Holiday Park Senior Center, 3950 Ferrara Dr., Wheaton. 240-777-4999. $30. Registration required.

— Compiled by Lisa M. Bolton

Submit an item E-mail mxliving@washpost.com at least 14 days before the publication date.