One of the interesting problems I came across the other day was of someone who had a challenge making his voice heard in larger meetings when competing with other voices, air conditioning and occasionally monsoon weather!
Your voice can be put under alot of pressure when competing with the white noise of machinery. The temptation is to shout above the noise which creates tension. Eventually your voice can become sore and hoarse with the pushing and your throat becomes inflamed.
Monsoons are not the only problem. Perhaps you have this sort of trouble when attending your stand at trade shows. You are at your post all day talking to potential customers. You haven't had chance for a break so your mouth is dry and you become dehydrated. You struggle through until evening and discover you just can't speak. And you have another 2 - 3 days of this.
The first secret is to take bottled water. Keeping your body hydrated is crucial for your voice's welfare. Next give yourself as much opportunity as you can to find quieter locations in which to discuss important issues.
Ahead of time, relax, breathe and hum. On the day, every so often hide behind your stand then yawn and swallow - this is a simple voice workout to exercise the muscles of your larynx.Try lowering your voice and making your diction (pronouncing the consonents) as clear as you can. You don't need volume to be heard, you just need clarity. Don't be afraid to exaggerate your facial expression - you will get your meaning across more easily without tiring your voice. And use body language to take control of the situation and attract attention.
Especially cut down on coffee, fizzy drinks and alcohol (they dehydrate you), sugar and milk (can be mucus-forming) and eat plenty of fruit and vegetables (for the vitamin C which protects you from infection).
May you have a very successful few days with plenty of business generated
