With 12-year-old daughter, Lourdes, and her two youngest children, David Banda and Mercy, in tow, the performer was dressed in black as she arrived in the French city to visit the family of injured workers and a French technician killed in the accident at two local hospitals.
"My prayers go out to those who were injured and their families along with my deepest sympathy to all those affected by this heartbreaking news," Madonna said in a statement last week.
The Material Girl, 50, was originally scheduled to perform her concert on Sunday at the Velodrome, a 66,000-seat venue where the accident occurred.
Charles Criscenzo, 53, was the lighting technician who was killed on the stage, and Charles Prow, 23, from Great Britain, died shortly after at a hospital. At least eight other workers were hospitalized.
A criminal investigation has been launched into the cause of the accident.