1000 wireless users in a single conference space

I've been asked to provide wireless access in a conference hall to ~1000 users who will connect to a server hosted locally.

The space is a large room with high ceiling & no line of sight obstructions. I will be able to hang APs from the ceiling if necessary. Data should be fairly light, no Voip or video streaming. The big issue from what I can gather is the number of simultaneous users.

Correct me if I'm wrong but there is no practical way to do this with consumer equipment, right?

What would I need to pull this off? A Xirrus XR-4###?

Thanks for your time
Ed