How to support your child at swimming events is a page I just came across via my Facebook account. Have a look at their tips. I shall also put a permanent link to this page in my links section.
Keeping clam is the main message. But also please do remember, your child won’t be able to hear you once they are in the pool. It is very loud in a swimming arena and because swimmers’ ears are under the water most of the time, they cannot hear you. They can hear the crowd in general.
In most level 3 age groups, where coaches are allowed pool side and team mates often support club swimmers, they are immersed in poolside support. The only time the child will see the parents is at the start when they line up and glance up into the gallery.
Another good tip is also become an official/volunteer, it keeps you busy and helps your child a lot.