For the purposes of subsection (2)(c), the relevant authority must consult, or attempt to consult, with
(a) if there is a body known to the relevant authority to represent persons who have a significant interest in the place of assembly the body; or
(b) in any other case each person, body, or agency, (an interested person) known to the relevant authority to
have a significant interest in, or responsibility for, the place of assembly.