“Oystering on the Bay,” local-history discussion, part of the “Calvert Conversations” series. 10-11 a.m., Calvert Library Twin Beaches branch, 3819 Harbor Rd., Chesapeake Beach. Free. 410-257-2411 or www.calvert.lib.us.
Solomons farmers market, fruit, vegetables, herbs, flowers and bedding plants from local farms, plus seafood and baked goods. 4-8 p.m., Riverwalk (near the Pavilion), Solomons. www.calvertag.com or 410-535-4583.
Library “Back to School Night,” for students and parents, information on resources and services. 6 p.m., Lexington Park Library, 21677 FDR Blvd. 301-863-8188 or www.stmalib.org.
Charles County Archaeological Society meeting, James Gibb of Gibb Archaeological Consulting will discuss his work at Elk Landing. Guests are welcome. 7 p.m., La Plata Police Department, 101 La Grange Ave. Free. 240-682-1718 or 301-375-
Boardwalk farmers market and car show, fruits and vegetables, bedding plants, local seafood, baked goods and local wines, plus classic cars and live music. 6-9 p.m., Bay and Chesapeake avenues, North Beach. www.calvertag.com or 301-855-6681.
Art fair at the farmers market, local artists display their works at the weekly farmers market. 6-9 p.m. , North Beach Boardwalk. 301-855-6681 or www.northbeachmd.org
Prescription drug disposal day, Calvert residents’ unneeded and expired medications will be disposed of safely. Mount Hope Community Center, 104 Pushaw Station Rd., Sunderland. Free. 410-535-3733.
Barstow farmers market, vegetables, fruit, herbs, flowers and bedding plants from local farms, plus seafood and baked goods. 7:30 a.m.-noon, Calvert County Fairgrounds, 140 Calvert Fair Dr., Barstow. www.calvertag.com or 410-535-4583.
Household hazardous-waste collection day, hosted by the Calvert County Department of Public Works, Division of Solid Waste. Proof of residency required. For a list of acceptable materials, go to www.co.cal.md.us. 8 a.m.-2 p.m., Mount Hope Community Center, 104 Pushaw Station Rd., Sunderland. Free. 410-326-0210.
Walk to End Alzheimer’s, two events to raise fund and awareness, hosted by the National Capital Area Chapter of the Alzheimer’s Association. 8:30 a.m. check-in; 9:30 a.m., walk begins. Asbury-Solomons, 11100 Asbury Cir., Solomons; and Regency Furniture Stadium, 11765 St. Linus Dr., Waldorf. 301-934-5856 or AlzWalkSoMD@alz.org.
Gently used books sale, hosted by Friends of the Library. 9 a.m.-3 p.m., Calvert Library Prince Frederick branch, 850 Costley Way. 410-535-0291 or 301-855-1862.
Scrapbooking day, hosted by the rescue squad auxiliary. 9 a.m.-7 p.m., Mechanicsville Volunteer Fire Department, 28165 Hills Club Rd. $40, includes two meals and crafting space. 301-884-4709 or email@example.com.
“Showcase of Bands,” marching bands from St. Mary’s County and elsewhere perform in a competition hosted by Great Mills High School. 1 p.m., the school, 21130 Great Mills Rd. $7. 301-904-0829.
“Port and Paddle,” canoe or kayak from winery to wharf (car-pool back to the start); hosted by Young Professionals Initiative of St. Mary’s County. 1 p.m., Port of Leonardtown Winery, 23190 Newtowne Neck Rd, Leonardtown. $45, includes tastings. 443-838-6429, www.ypi-smc.com or firstname.lastname@example.org.
Guided canoe trip, a paddling tour of Parkers Creek. 3:30-6:30 p.m., American Chestnut Land Trust, Scientists' Cliffs Road, Port Republic. $15, requested donation. 410-414-3400 or www.acltweb.org.
Open skate night, for all ages. Sponsored by St. Mary’s County Department of Recreation and Parks. 6-9 p.m. Saturday, Sept. 22 and 29, Leonard Hall Recreation Center, 23145 Leonard Hall Dr., Leonardtown. $5; skate rental, $2.50. 301-475-4200, Ext. 1800.
Square dancers’ open house, for those interested in learning the steps; hosted by Aqua Squares. 7-9:30 p.m., Southern Community Center, 20 Appeal Lane, Lusby. Free. 301-855-7937, 301-863-8054 or www.aquasquaredancers.org.
Health lecture, a presentation by infectious disease specialist Rita R. Colwell on Vibrio vulnificus, a flesh-eating bacteria found in brackish ponds, estuaries and the Chesapeake Bay. 2 p.m., Calvert Marine Museum, 14200 Solomons Island Rd., Solomons. Free. 410-326-2042.
Monday morning movies, stories, songs and movies for children and their caregivers. 10-11 a.m., Calvert Library Prince Frederick branch, 850 Costley Way. Free. 410-535-0291 or 301-855-1862.
“Calvert Eats Local,” a discussion of ways to make more frequent use of area agriculture. 7-8:30 p.m., Calvert Library Prince Frederick branch, 850 Costley Way. Free. 410-535-0291 or 301-855-1862.
Résumé and cover letter workshop, 10 a.m.-noon, Calvert Library Prince Frederick branch, 850 Costley Way. Free. 410-535-0291 or 301-855-1862.
Prince Frederick farmers market, fruits and vegetables, bedding plants, local seafood, baked goods and local wines. 3-7 p.m., Calvert Memorial Hospital, 100 Hospital Rd., Prince Frederick. www.calvertag.com or 410-535-4583.
Coupon workshop, a presentation by Kimberly Pepper-Hoctor, known locally for TheGirlLovesCoupons.com, on money-saving shopping strategies. 6:30 p.m., Lexington Park Library, 21677 FDR Blvd. Free. Registration required.301-863-8188 or www.stmalib.org.
Book discussion, “Major Pettigrew’s Last Stand,” by Helen Simonson. 2-3:30 p.m., Calvert Library Fairview branch, Route 4 and Chaneyville Road, Owings. Free. 410-257-2101.
Voter registration, hosted by the League of Women Voters of St. Mary’s County. 3:30-5:30 p.m., Lexington Park Library, 21677 FDR Blvd. 301-862-1183 or smc.lwvmd.org.
Book discussion, “The Cellist of Sarajevo,” by Steven Galloway. 7-8:30 p.m., Calvert Library Southern branch, 20 Appeal Lane, Lusby. Free. 410-326-5289.
Public issues forum, hosted by the St. Mary’s County Justice and Advocacy Council. Freewheeling discussion of a variety of topics will be encouraged. 7-8:30 p.m., St. Mary’s Ryken High School, 22600 Camp Calvert Rd., Leonardtown. Free. 301-373-8545.
National Active and Retired Federal Employees Association meeting, Calvert County chapter meeting will feature a short presentation by the office of Sen. Steny Hoyer (D). 1 p.m., Calvert Pines Senior Center, 450 W. Dares Beach Rd., Prince Frederick. Free. 410-586-1441 or NARFE1466@gmail.com.
Homeschoolers discussion, an overview of library resources available for homework and projects. 6 p.m., Charlotte Hall Library, 37600 New Market Rd. Free. 301-884-2211 or www.stmalib.org.
Public forum on prescription-drug abuse, sponsored by the Calvert Alliance Against Substance Abuse. Refreshments available. 6:30-8 p.m., College of Southern Maryland, 115 J.W. Williams Rd., Prince Frederick. Free. 410-535-3733.
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