This is the typical slope of an American curb ramp. Some ramps in service areas, such as loading docks, are much steeper than this. It is not necessary for the inspector to actually measure the slope of every ramp. It is probably much too steep. If that is so, the fact should be noted.
Many doorways have thresholds which can be barriers.
If all conferees are expected to eat together, that location must be accessible. Information about which hotels or dormitories are known to be accessible, and which are known not to be accessible, should be made available before the meeting. An accessible hotel must at least have rooms which do not require the guest to climb stairs. Most important is space. There should be room for a wheelchair to enter and to turn around inside the rest room.