Red Cross blood drives Thursday, 2-8 p.m. Seneca Creek Community Church, 13 Firstfield Rd., Gaithersburg; Friday, 10 a.m.-4 p.m. MSCI, 702 King Farm Blvd., Rockville; Monday, 9 a.m.-3 p.m. Apex Companies, 15850 Crabbs Branch Way, Derwood. 800-733-2767. www.redcrossblood.org. Walk-ins welcome.
Water aerobics Core-strength exercises led by Anne LeVeque. Friday at 7 a.m.; Monday and Wednesday at 7 p.m. Piney Branch Elementary School, 7510 Maple Ave., Takoma Park.
Seven-class pass $54.25, drop-in rate $8.
Line-dancing classes For fun and fitness, Saturdays and Mondays at 10:30 a.m. Schweinhaut Senior Center, 1000 Forest Glen Rd., Silver Spring. 240-777-8086. Free.
Nursing home Medicaid talk, A presentation by staff from the Montgomery County Department of Health and Human Services on the differences between Medicaid and Medicare, with a question-and-answer session. Monday at 2 p.m. Aspen Hill Library, 4407 Aspen Hill Rd., Rockville. 240-773-9410; Tuesday at 4 p.m. Twinbrook Library, 202 Meadow Hall Dr., Rockville. 240-777-0240.
Adventist HealthCare Walking Club Tuesday at 8 a.m. Westfield Montgomery Shopping Mall, 7101 Democracy Blvd., Bethesda. 301-469-6000.
Cancer support group For anyone with cancer and their friends, family and caregivers. Tuesday at 3 p.m. MedStar Montgomery Medical Center, 18101 Prince Philip Dr., Olney. 301-570-8693. Free. Registration required.
— Compiled by Lisa M. Bolton
Submit an item To email@example.com at least 14 days before the publication date.