Just to spread the word (because I was wondering and looked it up) here's all the scheduled Democratic debates:
June 28th at Howard University hosted and broadcast on PBS at 9pm
And these are from wikipedia:
July 23, 2007 - Charleston, South Carolina
CNN will hold this debate, which will have a simulcast on CNN en Español. Internet services You Tube and Google will also participate, allowing them to stream the event live and have clips for future use. Individual voters will be able to send their videos via You Tube and their questions through Google and CNN.com; the debate will be moderated by Anderson Cooper of Anderson Cooper 360. The debate is to be located on the campus of The Citadel.
 August 19, 2007 - Des Moines, Iowa
ABC News in conjunction with the Iowa Democratic Party announced a debate streamed on This Week moderated by George Stephanopoulos.
 September 26, 2007 - Hanover, New Hampshire
NBC News announced a debate to be streamed live on MSNBC. The debate is also in conjunction with New England Cable News and New Hampshire Public Radio. The debates will be at Dartmouth College.
 October 30, 2007 - Philadelphia, Pennsylvania
NBC News announced a debate to be streamed live on MSNBC.
 November 15, 2007 - Las Vegas, Nevada
The Nevada Democratic Party will host a Democratic debate to be aired on CNN. Potential moderators are Wolf Blitzer and Anderson Cooper.
 December 10, 2007 - Los Angeles, California
CBS announced a debate in conjunction with the California Democratic Party; potential moderators are Bob Schieffer and Katie Couric.
 January 6, 2008 - Johnson County, Iowa
The Des Moines Register and Iowa Public Television will host a Democratic debate in Johnson County, Iowa.
 January 15, 2008 - Las Vegas, Nevada
The Caucus of African-American Nevadans and Impacto will host a Democratic debate in Las Vegas.
 January 31, 2008 - California
The Los Angeles Times and CNN will host a Democratic debate in California.