A gathering of ten Jewish men (or women in reform and conservative Judaism) for the purpose of prayer is called a minyan.
It is called observation.
I believe it is called a solstice.
They were called Jews.
Halakha
The gathering of Italian Bishops to discuss the Catholic response to the Protestant Reformation was called the Council of Trent.
A gathering of nuns is called a nunnery. Or a convent.
People who practice Judaism are called Jews.
A large gathering of people is called a group, mob, crowd or a mass.
It is called a levee!
A clerical gathering is often referred to as a convocation, symposium, or conference.
punnet
Tango
A gathering
It is a Tribe.
A gathering of turkeys is called a flock. This is the term used for many different kinds of bird species.
A wake is held the night before the funeral. The gathering after the funeral is simply called a reception.
The gathering of scientific information is called research.