Conclave and Sit-in

Conclave noun - A confidential or secret meeting.

Sit-in and conclave are semantically related. In some cases you can use "Sit-in" instead a noun "Conclave".

Sit-in noun - A form of civil disobedience in which demonstrators occupy seats and refuse to move.

Conclave and sit-in are semantically related. Sometimes you can use "Conclave" instead a noun phrase "Sit-in".