You will arrive at an interview area where there may be other people waiting for you. Sometimes this will be in an enclosed room or in a quieter part of a working area. If it is the lesser make a concerted effort not to be distracted by background noise or events.
If possible, try and position yourself so that the interviewers will only have you to look at and consider. By doing so you should have their undivided attention because they should be used to the background noise. You should also then have an opportunity to observe some of the happenings behind them occasionally when it is appropriate to do so. This should provide further ammunition for you in your assessment of this job opportunity.
Make the same positive and pleasant personal introductions as you did earlier. Make sure that you get every other person's name and, if possible, their position. By knowing their position you should be able to anticipate what type of questions each person will ask. With a bit of thought you should be able to figure out how much of a say each person will have in making the final decision about who is offered the position.
The apparent leader of the interviewers should begin proceedings with some pleasantries and perhaps make some small talk to set everyone at ease. After a minute or two the light-hearted atmosphere will end and the interview proper will begin.
It is in these first few minutes after meeting you that the first impressions will be made. You should not be lulled into a false sense of security by the easy atmosphere prevailing until the question starts. You should be working hard to establish rapport with each of these people. You do this by making frequent eye contact and trying to involve them in the conversation prevailing at the time. You should immediately begin working on projecting your positive outlook and slipping in the occasional natural smile when appropriate.
It may surprise you to learn that a large part of the hiring decision may already have been made before you have answered your first question. There is no way of the knowing what that decision is so you have to continue in the belief that you're already halfway there. You have to put your best foot forward and aim to impress them with your answers and questions to come.