Africa - Energy, Oil and Gas Conferences and Exhibitions
http://www.mbendi.co.za/a_sndmsg/event_list.asp

This is a calendar of coming events in the African oil and gas industry.

American Petroleum Institute Events Calendar
http://www.api.org/events/

"API offers many meetings, conferences, seminars and workshops which provide opportunities for you to keep abreast of industry developments, learn new ideas to gain a competitive edge, and network with industry peers and customers. Check our calendar to see which of the wide variety of topics meet your needs!"

Chemical & Engineering News - Calendar
http://pubs.acs.org/journals/scheds/events.html

This is a calendar of events in the broad field of chemical engineering.

Conferences on Oil & Gas and Environmental Issues
http://www.offshore-environment.com/conferences.html

"Below you will find information on meetings on oil and gas and environmental issues."