Opening this week

• Maine artist Chris Nielsen presents new paintings at the Gallery at Harmon’s & Barton’s, 584 Congress St. The show will feature oil paintings of Cape Elizabeth and the Portland area. In the style of Monet, Nielsen’s work embraces the romance of Maine’s coastal communities.

The show will open with a reception from 5 to 7 p.m. Friday.

• At 7:30 p.m. Tuesday, Portland municipal organist Ray Cornils welcomes the Kotzschmar Festival Brass to Merrill Auditorium for the finale of the 2010 Summer Concert Series presented by the Friends of the Kotzschmar Organ.

Tickets cost $17, and admission is free for ages 12 and younger. A pre-concert lecture begins at 6:30 p.m.

Musicians will perform selections from Cesar Franck, W.C.E. Seeboeck and the popular final movement of Saint Saens’ Organ Symphony No. 3, arranged for organ and brass.

• The University of New England Art Gallery, 716 Stevens Ave., Portland, will celebrate Art for MARC, UNE’s Marine Animal Rehabilitation Center, from 5 to 9 p.m. Tuesday. The silent art auction and reception heralds the integration of arts and science.

Art for MARC features original art from a variety of artists whose work is inspired by the ocean environment. They hope to raise awareness of and support for marine mammals and the local waters.

Contributing artists are Dozier Bell, Michael Boardman, Robin Brooks, Tammy Charles, Therese Conte, James Cotsis, Stacy Cramp, Walter Crump, Deborah Ellis, Rebecca Goodale, Barbara Goodbody, Michael Heiko, Kathy Angel Lee, Cheryl Lichwell,

Harriet Matthews, Holly Meade, Stuart Nudelman, Meryl Ruth, Jim Sardonas, Alex Sax, Cat Schwenk, Amy Toensing, Nora Tryon, Andrew Valliere and Melita Westerlund.

The work will be sold through a silent auction, with 50 percent of the proceeds benefiting Maine’s only marine animal rehabilitation center. The rest goes to the artists.