* Monday, 6 p.m.: TV anchor Mike Wallace talks about power and broadcasting in a special online conference. Keyword: Centerstage
* Today, 6 p.m.: Candace Gingrich, sister of House Speaker Newt Gingrich (R-Ga.). Go CONVENTION
* Thursday, 7 p.m.: Diane Vaughan, author of "The Challenger Launch Decision," discusses the space shuttle disaster. Go CONVENTION
* Thursday, 6 p.m.: Rap artist MC Hammer talks about his career and answers questions.
* Today, 7 p.m.: Computer columnist Lawrence J. Magid hosts presidential candidate Pat Paulsen. Jump: CHAT
* Thursday, 6 p.m.: Director Barbet Schroeder discusses his new film, "Before and After." Jump: CHAT