Congressmen Edward Markey and Stephen Lynch, the two Democratic candidates for U.S. Senate, have agreed to participate in six debates between now and the April 30 primary, according to the Boston Herald.

The Boston Herald’s Chris Cassidy just Tweeted that three of the debates will be general format, with the remaining three focusing on jobs, domestic issues and foreign policy. One of the debates will be held in Boston, and others will be held in Lowell, New Bedford, Worcester and Springfield. The location of the sixth debate has not been determined.

Markey and Lynch are facing off to see who will take on the winner of the Republican primary in the June 25 special election to fill the seat vacated by John Kerry’s appointment as Secretary of State. Several Republicans are already in the running, and candidates have until Feb. 27 to gather the 10,000 certified signatures needed to appear on the primary ballot. Libertarian Daniel Fishman of Beverly is also considering a run.