MONDAY

Naturalist Series 9-11:30 a.m. in Jefferson

Hidden Valley Nature Center naturalist Chuck Dinsmore is leading a class called “Little Dyer Pond Ecology.” The course is meant to be a general overview of common pond ecology in Maine but will rely extensively on field observations and site specific findings at the nature center. Visitors will learn about common plant and animal associates in freshwater ponds and lakes. Abutting the open water at Little Dyer Pond are several other wetland habitat types. The group will visit some of the adjacent wetlands to learn about how they influence lake ecology and vice versa. The suggested donation for the class is $12. For more information go to www.hvnc.org/registration.

TUESDAY

Photographic Tour, 6:30 p.m. in Topsham

The Cathance River Education Alliance and the Topsham Library are hosting the next program in their monthly community nature series at the Topsham Library. Photographer David White has explored each of the alliance’s land trust properties. He’ll share a photographic tour of them. No cost, all welcome. Go to www.creamaine.org to learn more.

SUNDAY

Penobscot River Race, 9 a.m. in Indian Island

The Penobscot Indian Nation, in collaboration with American Canoe Association’s New England Paddle America Club, is hosting the Bashabez Run, the first canoe and kayak race on the Penobscot River. The Bashabez Run celebrates the recent collaborative efforts to restore the free-flowing nature of the lower river. It also honors the history and culture of the Penobscot Nation community. The Bashabez Run offers a challenging course through four significant, historic rapids and fast-moving current. The start of the race above Joe Peas Falls on Indian Island highlights the inseparable connection between the Penobscot Indian Nation and the river, and their role in the historic Penobscot River Restoration Project. The river race should take two to three hours. The finish will show recreational opportunities on the waterfront in Brewer and Bangor. To learn more go to www.penobscotculture.com.

UPCOMING

Beach Use Lecture 6 p.m. Aug. 28 in Wells

The 25th anniversary year of a Maine Supreme Court decision that defined ownership and public use of Maine’s intertidal lands and beaches will be marked by a series of lectures at the Wells Reserve at Laudholm Farm in Wells this summer. The next lecture in the series is “The Private Landowner Perspective,” featuring lawyers from the Portland law firm Curtis-Thaxter. It will take place at the Mather Auditorium. Registration, call 646-1555. For more information, go to www.wellsreserve.org.

Send calendar items to Deirdre Fleming at dfleming@pressherald.com