Been asked to add event wifi to a HS basketball Gymnasium for an event 6 months from now.....

So my town is going to have a fundraising event and they want to have an internal wifi network for the event as the venue is just not up to snuff to have that many people doing online things at once. It can be all an internal network...no outside Internet needed however I'm trying to understand what infrastructure I would need to provide WiFi to about 1100 devices in 3 distinct but wall adjoined rooms which people will be passing through.

I work in IT but on the development/programming side not on the networking side of the house. So please be a bit 4th grade in explanations.

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Thanks-R