If it's an indoor show it's also polite to bring a towel ringside for her to sit on while you're waiting to go in and/or for you to wipe up any discharge she might leave on the surface. Just keep an eye on the boys as some people don't do a very good job of keeping track of their dogs at dog shows (and even other bitches might be more reactive towards her...it's best not to consider a dog show an event for dog socializing in any case though
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In herding (per AKC rules) bitches in season run last in the test classes, and in drawn run order in the trial classes. It's a practical application...if you have a job needs to be done on a farm or ranch you wouldn't wait 2-4 weeks to do it just because of a bitch in season
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On a side (but slightly related) note...with our sled dogs growing up everyone was intact, life went on as usual when someone was in season (they were actual working dogs that provided transportation/hauled wood/gear etc so it would have been inconvenient otherwise) and there were never any unplanned pregancies. I can never figure out why people can't manage to prevent canine pregnancy without spaying/neutering
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