Before you leave home
Check you have everything you need to spend time on the poolside (sometimes the whole day!).
Plenty of swimming costumes (and spare hats, goggles and towels)
If the club is sending someone along to be on poolside with the swimmers, find out who it is so you'll recognise them when you get there.
Take plenty of poolside wear.
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Always assume it's going to be cold on the poolside. You can always take stuff off, but if you dont have it in the first place you can't put it on. I've gone to meets wearing shorts and a t-shirt outside because its the middle of summer, only to find the pool has its air-con up so high it's freezing inside!
Make sure you have enough to eat and drink throughout the day.
Take some entertainment with you.
A positive attitude.