The students decided to sit in on the lecture as an auditor
We will sit in on the next meeting to observe the proceedings
She likes to sit in on her younger brother's piano practice
Can I sit in on your study group tomorrow?
He asked if he could sit in on the training session
The journalist planned to sit in on the press conference
They decided to sit in on the workshop to learn new techniques
I will sit in on the final review before presenting
The manager allowed employees to sit in on the budget discussion
We're hoping to sit in on the audition for the play
Do you want to sit in on our meeting?
Yes, I would like to sit in.
Great, come join us then.
Protesters will sit in at the government building
Demonstrators will occupy the government building
Activists will stage a peaceful protest at the building