it's been a while since i watched it so i don't remember all the acrs in the season but lets start from the start.
The first event is Arargi and Shinobu's time leap.
Hanekawa and the tiger runs in parallel with hachikuji and the black ball arc hence why araragi only makes his appearance at the end of fight between black Hanekawa and the tiger.
Then Nadeko becomes a god.
Then Kaiki goes to deal with Nadeko.