The Patuxent Research Refuge's National Wildlife Visitor Center will present the Patuxent Wildlife Festival from 10 a.m. to 3 p.m. Oct. 18.
Animals, research displays, behind-the-scenes tours, conservation tram tours and children's activities are planned. All ages are welcome; admission is free (there is a small fee for the tram tours).
The National Wildlife Visitor Center is off Powder Mill Road, between the Baltimore-Washington Parkway and Route 197, south of Laurel.
Information: 301-497-5763; TDD, 301-497-5779; patuxent.fws.gov.
Historic Savage Mill will present an evening of Halloween events Oct. 31, beginning with shop-to-shop trick-or-treating for children from 5 p.m. to 9 p.m. The mill will provide trick-or-treat bags and Halloween safety tips.
Shoppers can pick up clues to a Mystery Quiz Contest from each merchant at the mill; the completed quiz can be submitted to any merchant.
An Art Walk through resident artists' studios and galleries is planned. The artists will hold wine-and-cheese receptions.
Howard County Tourism will offer Ghost Walks with information about the mill's 19th-century history and modern spooky doings, starting at 8 p.m. Registration: 800-288-8747.
A charity costume ball will be held in the mill's Great Room from 7 p.m. to 11 p.m. Guests can join the Halloween costume contest at the Ramshead Rathskeller at midnight. Live music, buffet-style food, a main course and dessert are planned.
Tickets are $45. Tickets: 410-792-2820.