Remove the author or the designation

Warning²Federal courts, Illinois courts21st and 22nd editions

A symposium, colloquium or colloquy cited as a unit carries the designation before the title and no author; a single piece inside one carries an author and no designation.¹

1. 1R. 16.7.3 Symposia, Colloquia, and Surveys.
2. 2A warning: the form is usually wrong under the rule in note 1, and context can justify it.