Providence Plantation will host will host a program on "Citizens Reforming American Democracy: Then and Now" from 4 to 7 p.m. Saturday at the plantation, 300 Textor Hill Road, Evans City. Cost is $10 per adult and $5 for children 12 and younger. An optional dinner follows the program at an additional cost of $15 for adults and $7.50 for children. Call 724-538-8818.

Harmony Museum on Mercer Street in Harmony, representing the town founded in 1804 by pacifist German Lutheran Separatists and their Harmony Society, offers guided tours of three buildings from 1 to 4 p.m. daily except Mondays and holidays; reservations suggested for weekends and required for groups. Call 724-452-7341 or 888-821-4822, e-mail hmuseum@zoominternet.net., or visit the Web site, www.harmonymuseum.org.

<B>National Aviary</B>, 700 Arch St., will offer free admission on Friday for children in costume. FliteZone has moved inside for a new show running from 11 a.m. to 1:30 p.m. Wednesdays through Sundays. Flamingos have been added to the spectacle. Hours are 10 a.m. to 5 p.m. daily except Christmas. Regular admission is $9 for adults; $8 for senior citizens; $7.50 for children ages 2 to 12; and free for children younger than 2. Call 412-323-7235 or visit the Web site, www.aviary.org.<B>Heinz History Center</B>, 1212 Smallman St., in celebration of Pittsburgh's 250th birthday is displaying "Pittsburgh At 250," honoring our region's historic anniversary celebrations in 1858, 1908, 1958 and 2008. Each section includes artifacts and documents from the anniversary celebration set against a panoramic view of the city from that time period. Featured artifacts include commemorative medals and souvenirs, as well as books, programs and special publications. The display will continue through early 2009. Hours are 10 a.m. to 5 p.m. daily, except holidays. Admission is $9 for adults, $7 for senior citizens older than 61, $5 for students with ID and for children ages 6 to 18, and free for children younger than 6. Call 412-454-6000.<B>Phipps Conservatory and Botanical Gardens</B> in Schenley Park is displaying among the plants some Donald M. Robinson photographs of the Chihuly glass that was exhibited at Phipps last year. The photography will be shown through Jan. 22, 2009. Phipps is open daily from 9:30 a.m. to 5 p.m. and until 10 p.m. on Fridays. Daytime 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 under 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 exhibiting "Born of Fire: The Life and Pottery of Margaret Tafoya" through Jan. 4, 2009. The first East Coast exhibit of the works of this master Pueblo potter, "Born of Fire" features more than 75 pieces created by Tafoya with additional works by her mother and descendants, including rare early works from the Santa Clara Pueblo where she lived. Tafoya was one of the last surviving Pueblo matriarchs of the early 20th century. Admission is $15 for adults, $12 for senior citizens, $11 for children 3 to 18 and full-time students with ID, and free to children younger than 3 and museum members. Hours are 10 a.m. to 5 p.m. Tuesdays through Saturdays, 10 a.m. to 8 p.m. Thursdays, and noon to 5 p.m. Sundays. Call 412-622-3131 or visit the Web site, www.carnegiemnh.org.