A good start is having an easily visible landmark at which the child and the parent can meet if they are separated. If this plan has not been effective after a reasonable time, contact the police.
Don’t panic when you first notice your child is missing.
If possible, have one parent remain visible at the location where the child was last seen while another searches the vicinity for the child.
It is helpful to have a current photograph of the child to show to police, and parents should consider taking one on a mobile phone when they arrive at the showgrounds.