This term has many different meanings in Kindred society. For instance, a prince may call court on all Kindred that dwell in his city at any given time. The Elders of the Inner Circle may do so as well. Justicars of course can on a whim call in court, however they would much rather call a conclave where they wield the most power at any time.
Even the Inner council during one of its 13 year closed door meetings in Venice is considered a court, where issues are discussed and brought up anywhere from how one prince is doing to what issues the Sabbat have that needs action right away.
"We would be fools not to take note of Jan Pieterzons and his court of do gooders"
Barrowed from a table top game session