With 3000 users, you are going to need multiple VLANs to create multiple Broadcast domains.
With a 5000 sq meter area to cover, you qre going to need a heirearchical soultion to limit the number of trailing cables.
To support the WiFi you probqbly want PoE capable devices.
What power supply will be provided and have you any idea how the floorspace will be layed out?
I would look at the 6500 series as your core, but theese are physicaly large and heavy devices, and may need additional cooling. As an alternative 3750 stacks would be OK. Dual for resiliance.
Distribution should probably be 3750 devices with PoE capabilities. Dual again.
Access would probably be 2960 devices.
As this is a temporary space, a Wireless Site Survey would be impractical / impossible, so go with lightweight access points and a wireless LAN solution engine.
99% of the setup can be done in advance, with only some wireless tuning required onsite.
Think about some of the practicalities, are you going to use copper of fibre between the layers of switches? If copper some form of colour codding might be appropriate, to diferentiate use. Also think about cooling, power, physical and data security, are you going to be providing internet access do you need a firewall. Do you 100% trust your users, do you need some sort of IDS? And remember it is i,possible to think of everything, so leave a pot of time and money for the things you miss.
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