The annual WeihnachtMarkt, or German-style Christmas Market, will take place Saturday and Sunday in the area of the Harmony Museum at Main and Mercer Streets in Harmony. Dozens of regional artisans and vendors present a taste of German holiday season tradition by offering shopping for artwork, handcrafted goods, toys and other wares as well as German imports. Hours are 11 a.m. to 7 p.m. Saturday and noon to 4 p.m. Sunday. Admission, which includes all-day access to the market and museum, entertainment and wagon rides, is $6 for adults, $5 for senior citizens, $3 for students and free for children younger than 6. Food will be available. Call 724-452-7341.

Butler County Heritage Center, 119 W. New Castle St., celebrating the 150th anniversary of the birth of the oil industry with two exhibits, will be open from noon to 4 p.m. Sundays during November and December (except Dec. 20). The William A. Lowry Family exhibit is now open for viewing. Lowry was a prominent Butler citizen who was a Civil War veteran and community leader. He married Annie Zeigler, daughter of politician Jacob Zeigler. Admission is $5 for adults, $2 for children ages 5 to 17, and free for those younger than 5. Call 724-283-8116.

<B>Carnegie Science Center</B>, North Side, will be the site of the unveiling of Roboni-i, a robotics toy, on Saturday. The toy is billed as the world's first programmable gaming robot, and it navigates itself, avoids obstacles, plays games, does tricks, and interacts with its environment. The center will be closed because of Steelers' home games on Sunday plus Dec. 6, 20 and 27. Regular hours are 10 a.m. to 7 p.m. Fridays and Saturdays and from 10 a.m. to 5 p.m. Sundays through Thursdays; closed holidays. Regular admission is $14 for adults and $10 for senior citizens age 62 and older and children 3 to 12. Parking is $3. Call 412-237-3400 or visit the Web site, www.carnegiesciencecenter.org.<B>Pittsburgh Children's Museum</B>, 10 Children's Way, Allegheny Square, is presenting "Tough Art" through Jan. 10; plus classes in baby yoga, clay art and cartooning. Museum hours are 10 a.m. to 5 p.m. Mondays to Saturdays; and noon to 5 p.m. Sundays. Admission is $11 for adults; $10 for senior citizens and children ages 2 to 18, and free for children younger than 2. Call 412-322-5058 or visit the Web site, www.pittsburghkids.org.<B>Heinz History Center</B>, 1212 Smallman St., is showing "Behind the Scenes with the Pittsburgh Steelers: Photographs by Mike Fabus" through January. Center hours are 10 a.m. to 5 p.m. daily, except holidays. Admission is $10 for adults, $9 for senior citizens age 62 and older, $5 for students with ID and for children ages 4 to 17, and free for children 3 and younger. Call 412-454-6000.<B>Phipps Conservatory and Botanical Gardens</B> in Schenley Park continues "Life in the Gardens: Fräbel Glass at Phipps" through January. This exhibit features the artistry of German-born artist Hans Godo Fräbel, a founding father of modern glass sculpture. Phipps is open daily from 9:30 a.m. to 5 p.m. and until 10 p.m. on Fridays. Admission rates are $10 for adults, $9 for seniors age 62 and older and students with ID, and $7 for children ages 2 to 18. Phipps members and children younger than 2 are admitted free. Call 412-622-6914 or visit www.phipps.conservatory.org.<B>Carnegie Museum of Natural History</B>, 4400 Forbes Ave. in Oakland, is hosting the exhibition "Whales/Tohora" through May 2. The interactive exhibit brings visitors eye-to-eye with some of the world's most elusive creatures. Museum hours are 10 a.m. to 5 p.m. Tuesdays through Saturdays, with additional hours until 8 p.m. Thursdays, and noon to 5 p.m. Sundays. Closed major holidays. Admission, which includes the Carnegie Museum of Art, is $15 for adults, $12 for senior citizens, and $11 for students and children age 3 and older, and free for members and children younger than 3. Call 412-622-3131 or visit www.carnegiemnh.org.

<B>Old Economy Village</B>, Route 65, Ambridge, is taking reservations for its Tante Kringle's Bakeri program planned for 10 a.m. to 12:30 p.m. Nov. 28. Children ages 6 to 12 can experience Tante's Berliners or donuts as Tante makes one "special" for each child. All will receive a ragball with little trinkets and candy rolled inside. Belsnickel, helper to St. Nicholas, will be in attendance. Admission is $22.50. Reservations are required by Nov. 20. Call 724-266-4500, Ext. 101.