Mayor Nutter balked, Brady said, at the potential costs while the city struggled financially.
"He made a statement - and I hold him to it - that we'll try for 2016," Brady said yesterday.
Nutter, who is not attending the meeting or sending anyone from his staff, seems nowhere close to being committed to a bid.
Through a spokesman, Nutter yesterday reiterated all the reasons he cited while responding cautiously when Brady floated the idea in September.
Nutter is concerned about the cost of security, part of the millions of dollars the region would need to raise to run a convention. A planning group from the private and public sectors also would have to be assembled.
"This meeting is a very preliminary step toward getting information and putting us in a position to evaluate and help make the decision about whether to pursue a convention," Nutter said.
Brady has been lobbying his colleague, Florida U.S. Rep. Debbie Wasserman Schultz, chairwoman of the Democratic National Committee.
A DNC official in June confirmed that Brady and Wasserman Schultz had spoken about the 2016 convention.
The Democratic National Committee was last held in Philadelphia in 1948, when the party nominated President Harry S. Truman. The Republican National Convention was also held here in 1948, when the party nominated New York Gov. Thomas Dewey.
The city hosted the Republican National Convention in 2000, where then-Texas Gov. George W. Bush was nominated.
A nonprofit set up to run the 2000 convention raised $66 million, including $39 million from taxpayers in the Philadelphia region. A report compiled by the city later said the convention resulted in $345 million in economic impact to the region.
On Twitter: @ChrisBrennanDN