Maybe it's possible they may not all be in the same room at the same time? At my son's first assessment, he had the Developmental Pediatrician, Occupational Therapist, Speech Therapist, and Physio. Also the woman who is our contact for the centre. Anyway, they weren't all in the room at the same time - there was one of those mirrors that you can look through, so some would come in and others would observe through the mirror. (Sounds like a weird cop show, but it was totally fine) They were actually really great and able to engage my son pretty well! xx
Lots of luck xx