A police check is not necessary for an event like the Education Expo. If it was, I would imagine that the organisers would have made that clear. Nevertheless, it is highly recommended. If it cannot be done prior to the event, it can still be useful to have it performed afterwards. This applies to anyone and everyone who will be at the event, not just people who wear costumes and/or actively interact with children.
police check == http://kids.nsw.gov.au/check/intro.html?
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