Will,
Glad to see that the school is interested in displaying robots, It would be useful to know what arrangements the school will be making for the display of these robots.
If they want them for static display only then there is no problem.
However, if they want to run any of them then it would be in the schools interests to contact us on info@fightingrobots.co.uk for advice regarding a suitable arena, as there would certainly be issues with regard to health & safety and public liability that the school would be required to address to satisfy their legal obligations.
Just something you should to be aware of.

Good luck with the event,
Regards,
Fighting Robot Association.