Oh, right. Well I can tell you what happens where I work - maybe others can say if it is the same of different in different parts of the country.
Prior to the meeting, everyone involved - the 'TAC' (Team Around the Child) is asked to provide as much up to date, factual information about the child as they can, according to their speciality (so a SaLT would obviously be commenting on the Speech and Language, and a physio on their gross motor skills and physical developments, and so on). 'Education' would be the Nursery or school they attend.
Sometimes the Parents are asked to fill in a one page profile "My Story" before the meeting, and sometimes they are completed at the meeting.
The meeting is then to bring all these reports together, and read through them, and (if not done previously to write up the Parents' perspective - or young person for an older child), and to check that they present a true and accurate picture of the child. Technically it is to make the decision to put a formal request in to the Local Authority, to ask them to assess the child. In reality, they only hold the meeting if that is what is needed.
The local authority panel, obviously don't know your child, so the information this meeting put together, is what they make their judgement on, so it is important to make sure all the information is there.
Before the meeting (if you haven't already been asked for your views) it makes sense for you to write down anything that might be relevant..... from pregnancy / birth history, to when you first had concerns...... from any adjustments you make for your child that others might not have to make for theirs (this might be about dietary needs or seeming fussiness, it might be about sleep patterns, it might be about you avoiding public toilets because f the noise of hand driers, it might be about people outside the family not being able to understand speech, it might be about only being interested in one thing, it might be about anything. Most probably a list of things, but give it some thought beforehand because families have sometimes become so used to the adjustments, they don't really think about them any more.
Where possible, try to quantify things - so, instead of saying {just as an example} 'He's a poor sleeper', try to say 'We put lights out at 7.30, then he wakes at 11, 1, and 3,30, but only for 5 - 10 mins each time', or whatever the pattern. Instead of 'he's a fussy eater', say 'He will only eat foods that are beige coloured, and nothing that has been touching another food', and so forth.
When you are in a meeting, it can be easy to forget things, hence me thinking it makes sense to make a few notes beforehand.
They will also ask you about your hopes and aspirations....... what would you like him to be able to do in 2 years time ? etc., so worth thinking about that (the Chairman of the meeting will guide you, don't worry, but it is nice to know what you will be asked before a meeting sometimes 
Ask away if there is anything else you need to know. There are loads of helpful posters on MN.