An open house for teachers and educators will be held Oct. 18, from 3 to 5 p.m., at the U.S. Fish and Wildlife Services’ Visitor Center, Assabet River National Wildlife Refuge, 680 Hudson Rd., Sudbury. Learn about the environmental education opportunities at the Visitor Center. If you have any questions, contact Bill Rand at 978-562-3527 ext. 116 or [email protected].