At the local parish level: the court is a kirk session. Kirk sessions oversee the local congregation and its parish, and consist of elders presided over by a minister.
At the district level: the court is a presbytery. Presbyteries consist of all the ministers in the district and an equal number of elders, along with members of the diaconate (a form of ordained ministry, usually working in a complementary role in a ministry team in both parish and industry sector contexts).
At the national level: the court is the highest court of the Kirk - the General Assembly. The General Assembly consists of around 400 ministers, 400 elders, and members of the diaconate, all representing the presbyteries.
The Presbytery of Greenock and Paisley meets for ordinary business 10 times per year and meets at other times (e.g. for ordinations and inductions of ministers etc.) as determined by the presbytery.