My sister turned off my PS4 in the middle of my triathlon on Grand Theft Auto 5. With autosave will I be able to resume where I was in the triathlon?
To piggy back and credit to the comment section above @ヴァイシャリ and @Nicholas Aysen - Unfortunately you will not spawn where you left off in the Triathlon. This is because there is no save point / Auto-save anywhere during these events.
When your PS4 comes back on you will most likely spawn back on the beach near the starting line and will have to retry the triathlon.
I hope this helps!