STRIP DISTRICT: This is the last week to view the "Clash of the Empires: The British, French & Indian War, 1754-1763" at the Senator John Heinz Pittsburgh Regional History Center, 1212 Smallman St. The center is open from 10 a.m. to 5 p.m. daily and admission is $7.50 for adults, $6 for seniors older than 61, $5 for students with ID, $3.50 for children ages 6 to 18, and free to members or children younger than 6. For details, call 412-454-6000.

OAKLAND: The University of Pittsburgh's Center for Philosophy of Science presents "Francis Crick as a Neuroscientist," with speaker Robert Olby, a research professor in the department of history and philosophy of science, at 12:05 p.m. in Room 817R, Cathedral of Learning, 4200 Fifth Ave. For details, call 412-624-1052.

OAKLAND: Carnegie Mellon University hosts a lecture with Krzysztof Wodiczko, the 21st Robert Lepper Distinguished Lecturer in Creative Inquiry, at 6 p.m. in the McConomy Auditorium, University Center. For details, call 412-268-5765.

OAKLAND: The Carnegie Museum of Natural History presents "Cougars, Bears and Wolves: Interactions and Survival in the Yellowstone Ecosystem," with Dr. Toni Ruth of the Wildlife Conservation Society, at 6:30 p.m. in the museum's Natural History Earth Theater, 4400 Forbes Ave. Admission is free. For details, call 412-622-3131.

OAKLAND: Carnegie Mellon University's Saudi Students House hosts an open house about Saudi Arabia from 4:30 to 7 p.m. in the Connan Room, University Center, 5032 Forbes Ave. For details, call Tawfiq at 412-969-0590.

OAKLAND: The Middle East Peace Forum of Pittsburgh presents Jules Lobel speaking on "The Occupied Territories: Legal, Moral and Political Questions" at 7 p.m. at the University of Pittsburgh School of Law, 3900 Forbes Ave. For details, call 412-371-1000.

OAKLAND: The Catholic Historical Society of Western Pennsylvania presents "The Role of Women Religious in the Development of Catholic Education in the United States," with speaker Sister Patricia McCann, director of archives for the Sisters of Mercy, at 7 p.m. in Synod Hall, 125 N. Craig St. Admission is free. For details, call 412-343-0860 or visit www.catholichistorywpa.org.

DOWNTOWN: The Pittsburgh Area Jesuit Alumni sponsors "The Dechristianization of Europe: Is America Next?" with speaker Avery Cardinal Dulles at 7 p.m. at the Duquesne Club, 325 Sixth Ave. A $20 donation and business dress are requested. A reception begins at 6 p.m.; to register, call 412-355-7070.

DOWNTOWN: The Western Pennsylvania Chapter of the Association of Fundraising Professionals holds its April meeting and breakfast at 8 a.m. at the Rivers Club, Oxford Centre, 301 Grant St. Fee us $35. To register, call 412-642-7725.

OAKLAND: The University of Pittsburgh's Office of the Provost, University Center for International Studies, International Business Center, Katz Graduate School of Business and School of Engineering present "Sustainable High-End Outsourcing: The Edge of Innovation," from 1 to 4 p.m. in Room 521 of Alumni Hall, 4221 Fifth Ave. For details, call 412-648-1644.

UPTOWN: The sixth annual Forensic Science and Law Conference, "Justice for All," opens with registration at 6 p.m. in the Bayer Learning Center at Duquesne University. For details, call 412-396-1330 or visit www.justiceforall.duq.edu.

BELTZHOOVER: The Elder-Ado McKinley Park Senior Quilters host a "Fashion Show of Quilts" from noon to 5 p.m. at 900 Delmont Ave. Fee is $3. For details, call 412-481-2433.

EAST LIBERTY: The Pittsburgh Glass Center hosts the opening of "Truth/Beauty," from 6 to 9 p.m. at the center, 5472 Penn Ave. Admission is free. For details, call 412-365-2145.

BLOOMFIELD: Morningside Church of God in Christ, 5173 Dearborn St., hosts a Spring Prayer Conference from 10 a.m. to 3 p.m. For details, call 412-361-9865.

BLOOMFIELD: Wildflowers in Bloom on Earth Day, a project by Carnegie Mellon University student Wahyan Au, starts at noon at moxie DaDA art gallery, 4510 Liberty Ave. Volunteers are to meet, break into groups and plant seeds around Bloomfield. Picnic celebration follows at 4 p.m. For details, call 412-682-0348.

DOWNTOWN: The Catholic Business & Professional Women's Association hosts a Spring Gala Fashion Show and Luncheon at the Omni William Penn Hotel, William Penn Place. Fee is $30; proceeds benefit Rednal Retreat Center. For details, call 412-628-7132.

HIGHLAND PARK: The Sierra Club hosts an Earth Day festival from 11 a.m. to 12:30 p.m. at the Highland Park Rhododendron Shelter, featuring music, speakers, children's activities and information from local government groups. A neighborhood walk follows from 12:30 to 3 p.m.

MORNINGSIDE: Volunteers are needed for the Help Clean Up the Community of Morningside, as part of the Great PA Cleanup. Interested individuals are to meet at 10:30 a.m. at Natoli Field to clean up the area near the field and Baker Street. Call 412-682-5280 for details.

OAKLAND: Carlow University presents "Women Making Waves: Leadership in a Changing World," from 9 a.m. to noon in Aquinas Hall. Admission is $40. For details, call 412-578-8786.

OAKLAND: The Carnegie Museum of Natural History, 4400 Forbes Ave., celebrates Earth Day with a lecture by Mike Lanzone, a member of the team that discovered the ivory-billed woodpecker, at 1 p.m. Other activities that are free with museum admission are Science on Stage, Discover Carts and a special Earth Theater show. For details, call 412-622-3131.

SCHENLEY PARK: The Clean Pittsburgh Commission, Waste Management and Pennsylvania Department of Environmental Protection host a recognition party for volunteers who participate in the Great PA Cleanup at the Vietnam Veterans Pavilion from noon to 4 p.m. For details, call 412-488-7490, Ext. 243.

SOUTH SIDE: PA CleanWays, Starbucks employees and interested volunteers clean the Monongahela riverfront at Station Square, starting with registration at 8:30 a.m. Cleanup begins at 9 a.m. and ends at noon. Parking tickets for the West lot are to be validated and complimentary coffee and tea is to be available for volunteers.

SOUTH SIDE: Consumer Credit Counseling Service of Western Pennsylvania is offering a free first-time home buyer workshop from 9 a.m. to 1 p.m. at the CCCS Education Center, River Park Commons, 2403 Sidney St., Suite 400. For details, call 1-888-511-2227, Ext. 145.

SQUIRREL HILL: Frick Environmental Center, 2005 Beechwood Blvd., hosts an Earth Day celebration from 10 a.m. to 4 p.m. Volunteers are needed for the planting of 1,600 native trees; advance registration is suggested. For details, call 412-422-6538, or visit www.city.pittsburgh.pa.us/parks.

TROY HILL: Most Holy Name Church, 1700 Harpster St., hosts "Treasures and Trash," a two day flea market, from 9 a.m. to 7:30 p.m. today and 8 a.m. to 1 p.m. tomorrow in the church basement.

EAST LIBERTY: The women of the Lincoln Avenue Church of God, 404 Lincoln Ave., host "Women Changed by the Word" at 11 a.m. For details, call 412-361-7748.

OAKLAND: St. Paul Cathedral, Fifth Avenue and Craig Street, host "End of Life Issues, Making Medical Decisions in Advance," at 1:15 p.m. with speaker Sister Mary Traupman. For details, call 412-621-4951.

To list events happening within the city limits, please fax information to City Calendar, 412-391-8452. Include specific location, time, day and cost. Indicate the daytime or evening phone number of the sponsor with all submissions and a phone number readers may call for more information. Or mail information to City Calendar, c/o Maria Carpico, Pittsburgh Post-Gazette, 34 Blvd. of the Allies, Pittsburgh 15222. Information should be received by the Wednesday before the event.