S.S.
I remember that feeling. funny how having kids changes so much. Anyway, having spent a million years also taking other children on field trips I advise you to dress them in similar colored bright shirts (Yellow, orange,red?) so that if they are even a foot or two away you can see them, hold their hands when there are crowds and they should not leave you or dad's sight. Anybody has to go to the bathroom or drink water everyone goes together. It's too bad we have to be so nervous, but you will have a good time, too.