Volunteer and master naturalist Mike Quinlan leads a tour of the sanctuary’s smaller outlying parks (ages 10+). 8-11am, Jug Bay’s Wooton’s Landing Wetlands Park, Harwood, free, RSVP: jugbay.org.

8am-noon, North Beach Senior Center: 301-855-6681.

Plus soups sold and other vendors on site. 8am-noon, Cedar Grove UMC, Deale: 410-867-2818.

8am-2pm, Cape St. Claire Clubhouse: https://capegardenclub.wordpress.com

(Rescheduled) 9am-2pm, Annmarie Garden, Solomons: Annmarie.org.

Using clues, hunt for sculptured stones, mystery objects, plants and animals while learning about the history and features of the refuge in this drop-in program. 9:30am-1pm, North Tract, Patuxent Research Refuge, Laurel: 301-497-5887.

Enjoy a family-oriented bicycle outing and experience this natural area on two wheels (ages 10+). Learn the importance of reducing your footprint and leaving no trace on a 12-mile guided ride; bring your own bike, snack, water bottle and helmet. 10am-12:30pm, North Tract, Patuxent Research Refuge, Laurel, RSVP: 301-497-5887.

Don your superhero costume and join the 5th annual Shatter the Stigma 5K (8:30am), then head to the wellness fair for free health screenings, educational info, fitness sessions and more. 10am-2pm, Kellam’s Field, Chesapeake Beach: chesapeakebeachmd.gov.

Explore the farm and enjoy 10+ environmental literacy activities with Broadneck High School students, face painting, arts and crafts, science experiments, music and more; bring a picnic to enjoy on site. (Also May 21). 10am-3pm, Historic Goshen Farm, Cape St. Claire, free: goshenfarm.org.

Have short discussions where difficult questions are expected, appreciated and answered when humans are “on loan” for 20 minute conversations. 10am-3pm, Busch Annapolis Library, free: aacpl.net/human-library.

Celebrate the arrival of spring with some May Day traditions, play 17th century games, enjoy hands-on nature activities and explore the landscape. 10am-4pm, Historic St. Mary’s City, $10 w/discounts: hsmcdigshistory.org.