It was already on the cards that Max Verstappen would be in action with Team Redline sometime this weekend and now there seems to be confirmation. A sim race will be organised this Sunday at 15:30. Which drivers will be in action will be announced at a later date.
Judging from the tweet, it seems that racing will take place at an Italian circuit. It would make sense if that would be the Imola circuit, where Formula 1, Formula 2 and Formula 3 were actually supposed to be in action this weekend. That Grand Prix was cancelled due to extreme weather conditions and flooding.
In any case, Verstappen has been practising to be prepared. On Thursday, he practised with F3 cars on the rFactor2 platform at the Imola circuit. The sim race can be watched via Twitch.