Earth Day: Celebrate Earth Day and see spring plants at Ault Park, Mount Lookout 6:30-7:45 p.m. Tuesday. Meet at the pavilion. Free. Information: 321-6070, ext. 14.

Volunteer clean-up: The Great American Cleanup will include planting flowers and cleaning up interstate areas next Saturday. To volunteer, 352-4380; or www.keepcincinnatibeautiful.org.

Woodcraft classes: The Woodcraft Store, 500 Kolb Road, Fairfield, will have the following classes: basics of the dovetail jig, 6-9 p.m. Thursday, $65; basic woodturning techniques on a mini-lathe while making a pen and pencil set, 9 a.m.-3 p.m. next Saturday, $85; hand-cut dovetails, 1-4 p.m. April 27, $40. Information: 874-6181.

Waterford signing: Master sculptor and designer Fred Curtis will sign and date new Waterford purchases 6-9 p.m. Thursday in the crystal department at Lazarus at Kenwood Towne Centre.

Great Indoors classes: Free one-hour Venetian plaster (tintable wall surfacing material) demonstrations will be 1 and 7 p.m. Thursday and Friday, and 11 a.m. and 1 p.m. next Saturday at the Springdale store. 11925 Commons Drive, Springdale. Information: 346-1506.

Water Garden Society: Plant diversity and water gardens will be discussed at 7:30 p.m. Thursday by the Greater Cincinnati Water Garden Society at Hyde Park Elementary School, Edwards and Observatory roads. Free. Information: 467-9576.

Log, timber homes: The Log Home & Timber Frame Expo is at the Albert B. Sabin Convention Center, downtown, 11 a.m.-8 p.m. Friday, 10 a.m.-7 p.m. next Saturday, and 10 a.m.-5 p.m. April 27. More than 100 exhibitors and several fully constructed walk-through homes will be included, as well as various log and framing styles, seminars on construction and hand-crafted furniture, alternative energy, maintenance and restoration and financing information. $12 adults, 15 and under free. (888) 564-3976 or www.logexpo.com.

Bird-a-thon: A bird-a-thon, sponsored by the Dayton Audubon Society, will be kicked off 7-8 p.m. Thursday at Books & Co. in Kettering with Tom Hissong, educational coordinator of the Aullwood Audubon Center and Farm, presenting bird calls and a slide show. Free. During the bird-a-thon, from 5 p.m. Friday through next Saturday, Dayton Audubon members will be counting bird species to raise funds for Aullwood. Information: (937) 320-9042.

Living wreath workshop: Make a living wreath in a choice of two sizes and three plant combinations 10:30 a.m.-noon next Saturday at H.J. Benken Florist and Greenhouse, 6000 Plainfield Road, Silverton. $45, $60. Reservations: 891-1040.

Over-the-Rhine tour: Architreks of Cincinnati Preservation Society will lead a walking tour of Over-the-Rhine, east, 10 a.m.-noon next Saturday highlilghting lost landmarks. The tour will depart from Coffee Emporium Roasting Co. & Cyber Cafe at the Emery Center Apartments, 110 E. Central Parkway. $8 adults, $4 children, $20 family and $100 groups of 20. Information: 721-4506 or info@cincinnatipreservation.org.

Garden Club tour: The Ohio Association of Garden Clubs, Fairfield, will have a spring meeting Friday at the Cincinnati Flower Show at Coney Island, Moonlite Gardens. Mary Margaret Rochford will present a morning program about the history of the show, followed by lunch and a guided tour. Registration at 9 a.m. $20, plus $5 per car, by mail to OAGC Region #4, Evelyn Kuhlmann, 3950 Reily-Millville Road, Hamilton, OH 45013.

To get a home, garden or craft-related class listed, send the date, time, cost, location and information number to Joy Kraft by fax: 768-8330, or e-mail: jkraft@enquirer.com 10 days before the event