The only times I set up a parents meeting is if there is a pretty significant behaviour issue that needs to be addressed in length and without the child present.

I have done this twice. The first time was for a 3 year old who had bad behaviour. Breaking toys by throwing them downstairs and smashing them up, throwing the entire container of crayons on the floor, throwing dishes ACROSS THE ROOM! Bare in mind this was my first daycare child going back some 9 years lol, and he was the same age as my own son back then and my only daycare kid so this was a major learning curve for me too. I sat with the parents and discussed how their was at least 1 major incident a day and given that the child was old enough to know that none of these behaviours were acceptable that I wanted to be on the same page as the parents so we could correct this. Needless to say all that came out of the parents mouths was hot air and empty promises. 2 weeks later I gave notice as his parents could not stand up to him so there was nothing else I could do.

More recently about 2011, I had a child who displayed many cluster behaviours on the spectrum. We talked lots face to face and over the phone and had a plan in place of how to handle these behaviours and I recorded all my observations and the parents made an appointment with a developmental paediatrician. I chose to request a face to face meeting to discuss my summary and compare home and daycare behaviours and really invested my time for this child. It did help and I think mum and I were a great team. Dad on the other hand was something else and due to this a few weeks later he opted to stay home with the child to work on things. Needless to say they have since divorced since mum felt the dad was making the issues worse by saying that he was not displaying any behaviours that weren't considered normal and the healthcare professionals didn't know what they were talking about. I also assume there was way more going on than I could possibly conceive lolol

Anyway, that was the long answer haha I say yes to parent meetings if the individual family are working collaboratively with you for the benefit of the child. That being said, if I take your OP literally you mention meeting to discuss difference of opinions regarding the daycare and children. I do things in my daycare my way with the intention of meeting multiple needs the best way I can. There is for sure flexibility in that too, in most cases. However, my policies are none negotiable, if they don't like the way I run my business it isn't up for negotiation and I don't believe a parent meeting is necessarily the way to go. I telephone conversation should suffice. I'm not wasting my precious family time trying to talk people into why my way is how I run things. Any differences in opinions in terms of styles of discipline or other aspects of childcare should have come up in interview and in contract so if they didn't like the way you do things they should have chosen a provider who had similar methods as them. Is this relative or am I way of the mark?? Maybe if you gave an example of what differences you are referring to, then perhaps I could be more specific.