Earth Day hike registration deadline, take a picnic lunch and hike along the newest trail, Prince Frederick to the Bay Overlook, 8:30 a.m. Saturday at the trail head in Prince Frederick. Sponsored by American Chestnut Land Trust. Free; lunch, $5. Registration: 410-414-3400 or email@example.com.
National Active and Retired Federal Employees Association meeting, and used book sale, hosted by Chapter 1972. Loraine D. Hennessy, register of wills for Charles County, will be the guest speaker. 1 p.m. Waldorf West Library, 10405 O’Donnell Pl., Waldorf. 301-645-3077.
“Kids Just Want to Have Fun,” free reading program for children in kindergarten through third grade. 2-3 p.m., Calvert Library Prince Frederick branch, 850 Costley Way. 410-535-0291 or 301-855-1862; 6:30-7:30 p.m. Calvert Library Twin Beaches branch, 3819 Harbor Rd., Chesapeake Beach. 410-257-2411.
Coupon workshop, with Kimberly Pepper-Hoctor. 7-8:30 p.m. Calvert Library Prince Frederick branch, 850 Costley Way. 410-535-0291 or 301-855-1862.
Open studio, paint, draw, photograph, sculpt, knit or quilt. Take your materials and lunch. Participants will share ideas and critiques. 11 a.m.- 3 p.m. Fridays, Mattawoman Creek Art Center, Smallwood State Park, Route 224, Marbury. Free. 301-743-5159.
Baby-back rib dinner, hosted by Harry White Wilmer Sons of the American Legion Squadron 82. 5-8 p.m., American Legion Post-La Plata, 6330 Crain Hwy., La Plata. $12. 301-934-8221.
Dinner, hosted by American Legion Stallings-Williams Post 206 auxiliary. Meatball and sausage subs. 5:30-
7 p.m., American Legion Post 206, 3330 North Chesapeake Beach Rd., Chesapeake Beach. $10. 301-855-6466 or www.alpost206.org.
Flea market, 8 a.m.-noon, Richard R. Clark Senior Center, 1210 Charles St., LaPlata. 301-934-5423.
Indoor flea market, hosted by the St. Mary’s Fair Association. 8 a.m.-noon, St. Mary’s County Fairgrounds, 42455 Fairgrounds Rd., Leonardtown. Table rental, $20. 301-475-9543.
Yard sale, to benefit the Humane Society of Charles County. 8 a.m.-2 p.m., Tri-County Animal Shelter, 6707 Animal Shelter Rd., Hughesville. 301-645-8181.
Adult education orientation, for anyone 16 and older who wants to obtain a high school diploma. 9 a.m., Hunting Creek Annex, 4105 Old Town Rd., Huntingtown. Free. 410-535-7382 or www.calvertnet.k12.md.us.
Annual appraisers fair, sponsored by the Mechanicsville Volunteer Fire Department’s ladies auxiliary. Small fees and item limits on jewelry, coins, antiques and collectibles. 10 a.m.-3 p.m., Mechanicsville Volunteer Fire Department, 28165 Hills Club Rd. Free admission. 301-884-4519.
Gardening workshop, how to build a salad box with homegrown greens. 10-11:30 a.m., Calvert Library Prince Frederick branch, 850 Costley Way, Prince Frederick. Free. 410-535-0291 or 301-855-1862.
Rabies clinic, offered by the Calvert County Health Department for cats, dogs and ferrets. Pet licenses available. 10 a.m.-noon, Patuxent High School, 12485 Southern Connector Blvd., Lusby. Free; licenses for spayed or neutered pets, $7; not spayed or neutered, $20. 410-535-
5400 or 410-535-3922.
Season kick off, for archaeology days at Jefferson Patterson Park and Museum. Demonstrations, tours and activities for anyone interested in archaeology. 10 a.m.-5 p.m., Jefferson Patterson Park and Museum, 10515 Mackall Rd., St. Leonard. Free. 410-586-8501.
Financial workshop for youths, for ages 9-17. 10:30 a.m.-1:30 p.m., Christian Family Baptist Church, 7 E. Hawthorne Dr., La Plata. $5. 240-718-8276 or http://tasplace.eventbrite.com.
Gallery reception, to celebrate 10 years. 1-5 p.m., ArtWorks @7th, 9100 Bay Ave., North Beach. 410-286-5278.
Writers’ gathering, join fellow writers for dinner and information on the Maryland Writers Association. Children’s author G. Francis Johnson will be the guest speaker. 4:30-7:30 p.m., MiMi's Cafe, 3016 Waldorf Market Pl., Waldorf. $14. 301-396-5885, www.lifejourneyswritersclub.com or firstname.lastname@example.org.
Card party, hosted by the Hughesville Volunteer Fire Department and Rescue Squad’s ladies auxiliary. Only pitch will be played. Cake, coffee and tea included with $5 admission fee. 6:30 p.m., Hughesville Volunteer Fire Department and EMS, 15245 Prince Frederick Rd. 301-274-3368.
Swing and ballroom dance, sponsored by Knights of Columbus of Holy Face Church. No experience needed. Lessons, 7-8 p.m.; dance, 8-11 p.m. 7 p.m., Little Flower School, 20410 Point Lookout Rd., Great Mills. $8; couples, $15; seniors and students, $5. 301-645-8509 or email@example.com.
“An Evening with John Hodgman,” part of the Twain lecture series on American Humor and Culture. Live music by the Rusty Spurs. Open to the public. 7:30 p.m., St. Mary’s College of Maryland, 18952 E. Fisher Rd., St. Mary's City. Free. 240-895-4253 or firstname.lastname@example.org.
Magic and comedy night, for adults only. Must be 18 or older. Raffles, snacks and a cash bar. 8 p.m., Ridge Volunteer Fire Department, 13820 Point Lookout Rd., Ridge. $10. 301-904-3257.
“Walk With a Purpose,” hosted by the Charles County commissioners. Representatives of nonprofit groups will discuss their purpose in the county. 8:30 a.m. (rain date, April 27), Indian Head Rail Trail, White Plains. Free. 301-645-0580 or HuntC@CharlesCounty.org.
Dessert and a movie, “The Impressionists: The Other French Revolution (Volume II).” 2 p.m., Mattawoman Creek Art Center, Smallwood State Park, Route 224, Marbury. Free. 301-743-5159.
Chesapeake Community Chorus practice, no auditions required. 4-6 p.m., North Beach Union Church, 8912 Chesapeake Ave., North Beach. Free. 301-855-7477.
E-book workshop, learn to download books using library resources. Take your device. 7-8:30 p.m., Calvert Library Prince Frederick branch, 850 Costley Way, Prince Frederick. Free; registration required. 410-535-0291 or 301-855-1862.
Monday morning movies, 10-11 a.m., Calvert Library Prince Frederick branch, 850 Costley Way. 410-535-0291 or 301-855-1862.
“Kids Just Want to Have Fun,” reading program for children in kindergarten through third grade. 6:30-7:30 p.m., Calvert Library Prince Frederick branch, 850 Costley Way. 410-535-0291 or 301-855-1862.
Shrimp dinner, hosted by American Legion Stallings Williams Post 206 auxiliary. 5:30-7 p.m., American Legion Post 206, 3330 North Chesapeake Beach Rd., Chesapeake Beach. $10. 301-855-6466 or www.ALpost206.org.
“Tween Night” cooking class, for children in grades five through seven. 6:30-8 p.m., Calvert Library Prince Frederick branch, 850 Costley Way, Prince Frederick. Free; registration required. 410-535-0291 or 301-855-1862.
Home school day, “Working on the Water” is the theme. Activities focus on maritime heritage. 10 a.m.-
3 p.m., Calvert Marine Museum, 14200 Solomons Island Rd., Solomons. Five and older, $4. 410-326-2042.
Open house, sponsored by the Maryland Transit Administration, about restructuring routes 901, 906, and 907. 5-8 p.m., Accokeek Library, 15773 Livingston Rd., Accokeek. Free. 301-645-0580, www.charlescountymd.gov or HuntC@CharlesCounty.org.
“Calvertpalooza,” a lecture on recent works at the Calvert House site. The chief archaeologist will discuss findings. Open to public. 7 p.m., Historic St. Mary’s City, 18751 Hogaboom Lane, St. Mary's City. Free. 240-895-4990.
“Kids Just Want to Have Fun,” reading program for children in kindergarten through third grade. 2-3 p.m., Calvert Library Prince Frederick branch, 850 Costley Way. 410-535-0291 or 301-855-1862.
Mail: Community Calendar,
Southern Maryland Local Living,
The Washington Post, 3 Church Cir., Annapolis, Md. 21401.