Events are free unless otherwise indicated.

Symposiums & Seminars

National Convention Center 525 Arch St; Independence Hall; 215-409-6700 or www.constitutioncenter.org. Earth Day Celebration, event free with museum admission. Noon-5 pm Sun and Mon•Glory Days, Throwback to the '80s Party, celebrates the 1980s includes access to From Asbury Park to the Promised Land: The Life and Music of Bruce Springsteen as well as drinks and light fare. Ages 21+ Reservations can be made at 215-409-6700. $30 for members, $35 for nonmembers. 5:30-9:30 pm Thurs

Big Brothers Big Sisters Southeastern PA is hosting a few information sessions in April on how to become a Big Brother or Big Sister. Center City office, 123 S. Broad St., suite 2180; 215-790-9200 or www.bbbssepa.org. 8 am Tues/, 6 pm Wed, Noon Thurs, 10 am Sat

MAYA 2012: Lords of Time. Brief remarks by Richard Hodges, Williams director, Penn Museum, Luis Fernando Suazo, deputy chief of mission, Embassy of Honduras and Simon Martin, co-curator, Maya 2012: Lords of Time. Penn Museum, 3260 South St; 215-898-4045. 11:30 am-2 pm Tues

Lectures & Literature

Disintegrations: The Decline and Fall of Libyan Egypt, lecturer is Aidan Dodson, senior research fellow, University of Bristol, England. Penn Museum, 3260 South St; 215-898-4000 or www.arce-pa.org. $8 6:30 pm Tues

Authors

Free Library of Philadelphia. Central Library (Montgomery Auditorium), 1901 Vine St; 215-567-4341. www.freelibrary.org. E.O. Wilson, "The Social Conquest of Earth," General $15, Students $7. 7:30 pm Tues• David Bezmozgis, "The Free World" and Leela Corman, "Unterzakhn," 7:30 pm Thur.•Cornel West and Travis Smiley, "The Rich and the Rest of Us: A Poverty Manifeston," General $10, Students $7 7:30 pm Fri.

For a complete calendar of events, go to "What's Happening," at http://www.philly.com/philly/calendar