If you have to use a book or sheet, get the thing out and set up before it is your turn. If you need a specific note take a tuner with you, if you haven't got a tuner ask some one to play an A (or whatever) for you and launch.

One man's long introduction/setup is another man's song.

I think farting around is attention seeking and a bloody pain in the arse.

Off hobby horse and calm again. Got coat too...