The politicians say they have embraced the local LGBT community, with Rawlings-Blake performing the first gay marriage in Baltimore City in 2013 and conducting the first mass gay wedding in Druid Hill Park later that year.
Mizeur would be the first female and openly gay governor in Maryland if elected.
They plan to meet the crowd at 12:30 p.m. at the parade's start at Charles Street at Eager Street in Mount Vernon. The route runs to Mt. Royal Avenue and onto Oliver Street.
The parade is part of a festival that attracts thousands over two days and is sponsored by the Gay & Lesbian Community Center of Baltimore, a nonprofit group that provides education and advocacy for community members and their families and supporters.