Sometimes we say time adverbial clause without any preposition or conjunction like:
The last time I went to a coffee shop, I ordered a cup of americano.
The first time I went to a club, I was very surprised how noisy and dark it was.
The moment we laid eyes on each other, we fell in love.
Then, how about these?
I saw a girl studying at a coffee shop really hard. And about 2 weeks after I'd seen her studying at the coffee shop, I saw her dancing at a bar a week ago.
The night I saw her dancing,
The moment I saw her dancing,
I was attracted to her.