The actor, who has starred in some of Norway's biggest recent films, such as Kon-Tiki, Max Manus and Victoria, will be presenting alongside the singer songwriter Haddy N'jie.
The 28-year-old told NRK that the day's celebration would be the first time he had ever worked as a television presenter.
"I've never done anything like this before!" he said. "I was initially supposed to be just reading a text at Eidsvoll at an event on 15 May, but was in the process I was asked if I would like to have a "package solution" and wanted to be a presenter on 17 May. And that's what I decided to do," he said.
Oftebro said he was comforted by the fact that Haddy, his presenting partner had so much experience.
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The celebrations will see performances by Sissel Kyrkjebø, the Norwegian soprano and hip hop artist LidoLido.