Having read a lot about the Horizon Finale 2 being the last opportunity to race the course, I was like most, pretty disappointed. I held off on racing it for the 2nd time, and in doing so stumbled on something which has prolonged my interest in this game (personally).
It is possible to repeatedly race the Horizon Finale course via an Online Freeroam, if you DO NOT race it for the second time in the single player campaign. i.e. Because the Finale 2 race is on my map (in single player) it is also available to me in an Online Freeroam session. I am able to race it repeatedly with other players in my session (it requires a minimum of 2 players for the race to commence).
Obviously it means I can’t progress any further with my single player game without relinquishing this, but for me that doesn’t matter. Having this extra race that I can enter online with friends, is a nice find that I wanted to share.
I realise most people are way beyond this point in the game but thought I’d share this anyway, just in case it helps anyone playing at a slower pace than me! 
I can try later - but I also heard you can race it in online mode after completing it a second time as well.
It’s up to you if you want to test this yourself. I was planning on taking a peek later today so I can let you know.
I’ve deliberately not finished the 2nd finale so I can run it repeatedly.
I believe as long as you don’t get gold in the 2nd finale, you can enter it indefinitely.
I’m so cautious that I don’t even cross the finish line, I just quit the race when I get to the gantry at the festival.
This is how I break in my cars and get a feel for them.
I don’t race online, I normally just do rivals and really wish I could do a rivals finale … everything else that is a race is doable in rivals …
Thought I was on the Gran Turismo forums for a moment. Heh.
As has been mentioned, the finale is available indefinitely online. Create yourself a private free roam lobby and run the event as often as you would like, either by yourself or with friends. Unfortunately, filling the grid with Drivatars is not an option.
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You can complete the second finale in single player and it will still be available online.
YAY!!! I’m glad whoever told me this was right>!
You’re welcome. I wasn’t ever concerned with repeating the finale, so finishing it was never an issue to me. But I was surprised to see it in online free roam when running one of my broadcasts a few weeks back. We got about 10 or so racers together and went to town … to town … to town … to town … and finally back to the festival hub. Ha!