Around 200 guests including Schumacher's wife, Corinna, and their two children attended the opening of the exhibition in Marburg in the state of Hesse.
“Of course, we miss Michael on days like these,” Schumacher's manager Sabine Kehm told guests. “Unfortunately we cannot change what has happened.”
Kehm said that all that could be done was to hope and provide support “that he will one day be back again.”
Schumacher, 47, the seven-time F1 world champion, suffered head injuries when he fell on a rock in a skiing accident in Meribel, France on December 29, 2013.
He spent months in an induced coma before being moved from hospital to a rehabilitation clinic in June 2014.
His rehabilitation has continued at home in Switzerland since September that year, but neither Kehm nor his family have given details of his condition.
The exhibition by a long-standing sponsor of the former champion features racing cars from Schumacher's career as well as exhibits from his private ownership. It is due to run for two years.
Original source: Schumacher expo opens in Germany