Celebrate Earth Day on Sunday at the National Constitution Center and learn how you can go green.

From noon to 5 p.m., guests can learn how to become active citizens working for a better environment. You can take the "It Is Easy Being Green" quiz and see how much you know about living an eco-friendly life, and learn about environmental trailblazers such as Lady Bird Johnson. At 11:30 a.m. and 1:30 p.m., guests can do the math by calculating the founding fathers' carbon footprint to see how environmentally friendly Philadelphia was during Revolutionary times. From 10 a.m. to 3 p.m. in the Grand Hall lobby, try making recycled paper and making art out of used recycled items. If you're interested in politics and environmental activism, learn about how food and nutrition laws and environmental protection policies will be affected by the presidential election. At "election central" in the main exhibit, the center's staff, in conjunction with exhibits, explain where presidential candidates stand on environmental issues. Community partners including the Philadelphia Water Department will be on hand to give out information and answer questions.

Earth Day events will continue from 9:30 a.m. to 5 p.m. Monday at the center. Entry is free with general admission.

Earth Day, noon to 5 p.m. Sunday; through Monday at the National Constitution Center, 525 Arch St., Independence Mall. Center hours are 9:30 a.m. to 5 p.m. weekdays, 9:30 to 6 p.m. Saturday, and noon to 5 p.m. Sundays. General admission: $14.50; $13 ages 65 and older; $8 ages 4 to 12. Free 3 and younger and for active military with ID and members. Information: 215-409-6600 or www.constitutioncenter.org.

Hot House Jazz Band

On Saturday afternoon, local musicians the Hot House Jazz Band will return to the Creative Living Room in Swarthmore for the Jam-a-Long Family Music Concert for kids.

Beginning at 4:30 p.m., tubist Eric Henry, guitarist Jim Smith, and clarinetist Paul Butler will perform their funky, fun, bluesy jazz while singing and scatting. Kids can dance, sing along and learn to make funny sounds as well as improvise with percussion instruments.

Hot House Jazz Band was recognized in 1999 by the U.S. State Department as members of the American Jazz Ambassadors Program and recorded a live album at the Kennedy Center. They're committed to music education and collaborating with educators to plan residency activities that complement classroom learning. The concert is appropriate for children 2 to 10.

The Jam-a-Long Family Music Concert with the Hot House Jazz Band, 4:30 p.m. Saturday at the Creative Living Room, 15 Chester Rd., Swarthmore. Tickets are $7 at the door, but reservations are strongly recommended. For reservations and information, call 610-544-5800 or go to www.thecreativelivingroom.com.

Storybook Ball at Please Touch Museum

Kids and their caretakers can experience an enchanted Saturday evening at Please Touch Museum's annual Storybook Ball.

Children can dress up as their favorite character. The ball will feature carousel rides, music, dancing, and other activities. Appearing will be authors including Peter H. Reynolds; father and daughter author/illustrator team Jules and Kate Feiffer; and Stephen Savage. The Feiffers and Savage are both winners of the museum's 27th Annual Book Awards in the kids choice category.

Storybook Ball, 6 to 9 p.m. Saturday at Please Touch Museum, Memorial Hall, Fairmount Park, 4231 Avenue of the Republic. Museum hours are 9 a.m. to 5 p.m. Mondays through Saturdays, 11 a.m. to 5 p.m. Sundays. Storybook Ball tickets are $45, $35 for members. Family 4-packs are available for $160 for the ball. General admission to the museum is $15 for age 1 and older; museum members and infants free. Information: 215-581-3181 or www.pleasetouchmuseum.org.

Contact Monica Peters at mpeters@phillynews.com.