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Check out the area you'll be performing while. Does it feel right and can everyone view you well enough from outside your performance circle? Make that there are sufficient electrical extensions for one to plug within your gear, if these take presctiption the component of the room will your cables reach them? Take a long extension socket just in case. If you're singing on the night time take two microphones leaving one as 'reserve'. Well the same for microphone cables. If your main cable breaks or your microphone hits the floor and you've no replacement