Mick Schumacher will make his Formula One debut in Bahrain. He will not be driving in the Formula one race but he will participate with the post-Bahrain Grand Prix test sessions.

Not official yet
At this moment there is no official confirmation yet from Ferrari. However multiple sources have revealed that Mick Schumacher is scheduled to drive for the Maranello outfit on Tuesday. The next day he is scheduled to do some testing for Alfa Romeo. This will happen because he is now a Ferrari junior driver.
Mick Schumacher
Mick Schumacher is the son of the seven-time world champion Michael Schumacher. And there are people that say he deserves to be in Formula One purely for the name. However, if he will be assisting Alfa Romeo with the testing it will be his first time in a Formula One car.
Super license
With his Formula 3 victory last year Mick Schumacher secured the 40 points he needs for a Super License. But instead of jumping straight to Formula One he made the choice to follow the Formula 2 path instead. Since the Formula Super License points are only valid for three years is now up to him to make sure that he secures at least 10 points this year, since his 10 points from 2016 will expire this season.
Bahrein
Mick Schumacher will already be in Bahrein for his Formula 2 race debut. So it will be easy to switch to Formula One for a test. After his two races, he will spend Monday with Ferrari to work on preparations for his first run in the SF90 on Tuesday.