Leave nothing to chance
If you're using audiovisuals, make certain all equipment is working properly. If the program chair did her job, this will all have been taken care of. Don't bet your reputation on it.
Test the microphone. Have someone stand in the back of the room while you say a few sentences. The sound level should be adjusted so that you can talk into the mike in your normal voice and make yourself understood. Incidentally, you may find that you don't even need the mike. If you can do without it, don't use it.
Be sure you know how to adjust the mike so you will be able to move it to the right position for you after the previous speaker has used it. The idea is to make the adjustment before you start to speak. Avoid the awkwardness of ...
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