Providence Plantation, a center for living history presentations about 18th century frontier life, is scheduled to have a “Christmas on the Frontier Plantation” program from 4 to 7 p.m. Saturday at the center, 300 Textor Hill Road. Reservations are required. For admission and more information, call 724-538-8818 or visit the website, www.frontier-history.org. “A Walk with George Washington: 1753,” a presentation on dispelling local myths about the path and the Murdering Town site, is planned for 9 a.m. to noon Dec. 11. This event is limited to the first 100 reservations, and the cost is a donation.

Harmony Museum on Mercer Street in Harmony features the Yobp-Eckstein village and train-trolley display in the Wagner House annex during regular guided museum tours, which are 1 to 4 p.m. daily except Mondays and holidays. Reservations are suggested for weekends and required for groups. Call 724-452-7341 or 888-821-4822, or visit www.harmonymuseum.org.

<B>Phipps Conservatory and Botanical Gardens</B>, One Schenley Park, presents its winter flower show from Friday through Jan. 9. Nine of Phipps indoor gardens will transform to tell the tale of holidays past, present and future with topiary snowmen made of white Alyssum, hanging baskets, evergreens lit with thousands of LED lights, three G scale trains and close to 2,000 poinsettias. Phipps is open daily from 9:30 a.m. to 5 p.m. and Fridays until 10 p.m. Admission is $12 for adults; $11 for senior citizens age 62 and older and students with valid ID; $9 for children ages 2 to 18; and free for children younger than 2. Call 412-622-6914 or visit the website, www.phipps.conservatory.org.<B>Heinz History Center</B>, 1212 Smallman St., hosts a holiday book fair with many Pittsburgh authors from 10 a.m. to 2 p.m. Saturday. The exhibit“Vatican Splendors: A Journey through Faith and Art” containing original works by Michelangelo, Bernini and Giotto in the largest Vatican exhibit ever to visit North America, continues through Jan. 9. Tickets are $20 for adults, $17 for senior citizens and students with college ID, and $13 for children ages 6 to 13: children age 5 and younger are admitted free. Tickets are available online at www.ticketmaster.com, or by calling 888-588-4226.<B>National Aviary</B>, 700 Arch St., will have a Light the Night on Friday. Doors will open at 5 p.m. followed by the tree lighting at 6:30 p.m. The evening includes light refreshments, visits with Santa and a bird show carol sing starring some of the aviary’s most festive birds in their own rendition of holiday classics, including “I’m Dreaming of a White Chicken.” Cost is $20 for adults and $17 for children. Show seating is limited. Call 412-258-9439 for tickets. Breakfast with Santa will be held at 8:30 p.m. Saturday and Dec. 11 and 18; cost is $20 and includes admission to the aviary.<B>Children’s Museum</B>, 10 Children’s Way, Allegheny Square, has the exhibit “Whoosh!” featuring a Whirlwind Room, cockpit of an old-school airplane, rockets and bubbles, through May 29. “Tough Art” continues through Jan. 16. A Mister Rogers sweater drive is being conducted through Dec. 17. 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 older than 65 and children ages 2 to 18, and free for children younger than 2. Parking is $5 for nonmembers. Call 412-322-5058 or visit the website www.pittsburghkids.org.<B>Carnegie Science Center </B>North Side, hosts Lionel Train Days on Saturday and Sunday. NASA Family Science Night is set for Tuesday. This new event is geared toward middle school students and their families. NASA Family Science Nights will take place from 6 to 8 p.m. the first Tuesday of each month through April, with the exception of January. A pizza dinner is included. Cost is $7 per person per night. Registration is required; call 412-237-1637. The Miniature Railroad and Village exhibit has reopened for the holiday season.<B>ToonSeum</B>, Pittsburgh’s Museum of Cartoon Art at 945 Liberty Ave., features “The Art of Caroll Spinney,” a new exhibit that explores the life one of the world’s best-loved puppeteers through his original paintings and sketches, through Jan. 30. Spinney is best known for his portrayal of Oscar the Grouch and Big Bird on “Sesame Street.”Museum hours are 10 a.m. to 3 p.m. Wednesdays and Thursdays, 10 a.m. to 5 p.m. Fridays and Saturdays and 11 a.m. to 4 p.m. Sundays. Admission is $4 for adults and $3 for children ages 5 to 17; children younger than 5 are admitted free. Visit www.toonseum.org.