All three candidates took part in a May 7 debate on a Washington television station. Another Democratic debate, on Monday, will be hosted and aired by Maryland Public Television, while a third is to be broadcast on radio station WOLB June 5 and moderated by former state Sen. Larry Young.
Unlike the first debate, only two of the three candidates are expected to show.
Where will Brown be instead?
Lt. Gov. Anthony Brown has made plans to attend a community meeting in another part of Baltimore tonight.
"I apologize for the late notice, but I hope you will attend this important meeting with the Lt. Governor and his campaign regarding plans for Baltimore's future," Del. Maggie McIntosh wrote in an email to constituents about the event on Tuesday.
Brown's campaign said the meeting had been on the calendar for more than a week but that a location was only finalized over the weekend.
"Anthony Brown is very excited about the upcoming debates in Baltimore on June 2 and June 5," Brown campaign manager Justin Schall said.
"After having had to say no to dozens of community organizations and other media outlets, Anthony Brown intends to honor his commitment to doing three debates. If Doug Gansler and Heather Mizeur aren't going to honor their agreement, it's a little surprising the organization they would choose would be Fox Sinclair News."
The station is seen by some as having a conservative orientation because it is owned by the Hunt Valley broadcasting giant Sinclair.