One event I particularly remember, the venue had ONE AP (and they had assured us that they could provide WiFi coverage for our 500 users, that was set to high power, their AP I found during the event, it was on the floor under a bench outside the master ballroom. This was the venue that I eventually tracked down was handing out DHCP leases with IP addresses that had a gateway address in a different subnet than the client IP. That was, admittedly, 2005, but the confidence they had in being able to serve our attendees, despite us telling them it wasn't going to be as easy as they thought, was stunning.