The event is the first major international meeting of leaders and top diplomats since the memos began appearing on the website and in international publications this week.
Clinton said she discussed the documents with her international colleagues and says the cables would have no adverse effect on international relations.
The Obama administration has harshly criticized the leaking of the cables, saying the details in them could put lives at risk.
In an interview with Time magazine, the Julian Assange, founder of WikiLeaks, told a reporter that Clinton should resign.
He said Clinton encouraged state department workers to collect information on foreign diplomats, calling it espionage.
"She should resign, if it can be shown that she was responsible for ordering U.S. diplomatic figures to engage in espionage activities," Assange said.
In an interview with Forbes magazine, Assange said he's planning to release internal documents from a major U.S. bank. While he won't say which bank, in a separate interview last year, he said he had several gigabytes of data from a Bank of America executive's hard drive.
Assange has been placed on Interpol's most wanted list. He's not wanted in connection with the document leak, but rather a rape investigation in Sweden.
The Associated Press contributed to this report.