Go for a nature walk at the North Tract of the Patuxent Research Refuge, all ages, 2 p.m. Info.: patuxent.fws.gov or 301-497-5887.

Sunday

Go for a wildflower wander at the North Tract of the Patuxent Research Refuge, 9 a.m. Info.: patuxent.fws.gov or 301-497-5887.

Wednesday

Global Warming Action Alliance meeting features real estate developer Chip Akridge, 7 p.m. at Kent Island Public Library. Info.: www.globalwarmingactionalliance.org or 410-827-0276.

Friday

Go fishing until midnight at Fort Smallwood Park. Be in the park by dusk. Info.: 410-222-0087.

May 17

Tours resume at Thomas Point Shoal Lighthouse. Info: www.annapolismaritime museum.org.

Check out the Smithsonian Environmental Research Center's annual open house, including a wade-in and a kayak race with the West-Rhode Riverkeeper, 9 a.m. to 3:30 p.m. Info.: www.serc.si.edu or 301-238-2737.

Events at the North Tract of the Patuxent Research Refuge include a weed warriors work day at 9 a.m., a bird walk at 8:15 a.m., a "skull scene investigation" for ages 12 and older at 1 p.m. and an owl prowl at 7:30 p.m. Info.: patuxent.fws.gov or 301-497-5887.

Master gardeners teach composting tips, noon at Quiet Waters Park in Annapolis. Info.: 410-222-1777.

May 18

Join a herp search at the North Tract of the Patuxent Research Refuge, 2 p.m. All ages. Info.: patuxent.fws.gov or 301-497-5887.

Join the Fort Smallwood Park's bird club for a bird walk, 8 a.m. Info.: 410-222-0087.

May 20

Learn to identify birds at the North Tract of the Patuxent Research Refuge, 8:15 a.m. Info.: patuxent.fws.gov or 301-497-5887.

May 21

Programs at Smithsonian Environmental Research Center include a parent-child class featuring a "hidey hole hike" at 9 a.m. (free, registration required) and a free lecture on Revolutionary Era Annapolis at 7 p.m. Info.: www.serc.si.edu or 301-238-2737.

Learn about home energy audits at a meeting of the Chesapeake Climate Action Network, 7 p.m. at Calvary United Methodist Church in Annapolis. Info.: www.chesapeakeclimate.org.

May 23

The West-Rhode Riverkeeper Program's pumpout boat, the Honey Dipper, goes into service today. The boat operates Fridays through Mondays, 8:30 a.m. until 6:30 p.m. Hail the Honey Dipper on VHF channel 71 or call 410-940-3754.

Go fishing until midnight at Downs Park. Be in the park by dusk. Info.: 410-222-6230.

May 24

The Patuxent Research Refuge offers a two-day seminar on the basics of birding on the North Tract, ages 16 and up. Info.: patuxent.fws.gov or 301-497-5887.

Go for a wildflower wander at the North Tract of the Patuxent Research Refuge, 9 a.m. Info.: patuxent.fws.gov or 301-497-5887.

Smithsonian Environmental Research Center offers a canoe excursion at 9 a.m. ($12 adults, $6 kids). Info.: www.serc.si.edu or 301-238-2737.

Blues concert raises money for Chesapeake Climate Action Network, 8 p.m., Loews Annapolis Hotel. Info.: www.chesapeake climate.org or 410-269-0777.

Do you have an environmental event for the Chesapeake Calendar? E-mail it to ourbay@capitalgazette.com.