Help on getting into a drag race please

Can I get some help on actually getting into a drag race? My game progression is past the final showdown.

As I understand it, you have to go to the Air Field Car Meet, and in there you wait for a showdown to pop up. I can get into to the car meet just fine, but I never get a showdown prompt. When I press RT the only person there is me, everyone else are drivatars (I think, the only one with a “person” icon next to their name is me). This is in solo play (although I am connected to the internet), am I supposed to do this outside of solo play? I usually never get into the online components of Forza but I want that XBOX reward car so I want to do some practice (and test tunes) beforehand.

same problem here

You can also play drag races straight from online freemode.