When I titled my writing studio and my writing program " Writers Circle," I didn't mean the possessive Writers' Circle. In my title, the writers come and form a circle where they meet, make friends, and network with each other. They also talk and write about themselves or write fiction or just sit around a table and enjoy being here in my place with me.
In my title, Writers is plural and circle is a verb, not a noun.
Isn't that the beauty of language? We can make it say whatever we want.