Hollande will be in the Chateau Vincennes park Sunday afternoon in a working-class district of the capital, Radio France Internationale reported. Sarkozy will be downtown in the Place de la Concorde.
The Socialist rally features a concert, which prompted Nathalie Kosciusko- Morizet, Sarkozy's spokeswoman, to ask: "Is he scared no one would turn up if he just gave a speech?"
The first round of voting on Sunday, April 22, is expected to end without a winner. While Sarkozy and Hollande are almost certain to be the top two vote-getters, neither is likely to win an absolute majority.
Jean-Luc Melenchon, the Communist-backed candidate of the Left Front, now appears to be running neck and neck with Marine Le Pen, candidate of the right-wing Front National.
Melenchon, who has been holding large rallies throughout the campaign, blogged that Hollande and Sarkozy are now copying him. Melenchon's weekend rally was Saturday in Marseille.