Special-interest groups
One can call a group of people with similar interests 'friends.' One becomes friends with another because they share a similar interest. One can have many friends that share the same interests as each other.
You could call it a mixed group with varying interests or a diverse group with different priorities.
culture
This type of activity is also known as a book club. People with the same interests gather and talk about books they've read. You can also call this a group meeting.
A population is a group of experimental subjects that share a common property of interest.
A group of people call the socs.
pee
A group, crowd,
blassyem
Genocide
The audience.
A septet.