Ungerboeck allows room bookings and functions to be assigned a usage. In Events2HVAC, you can select which usage codes to exclude from control in Events2HVAC. A common use-case is to create an usage code for “Maintenance”. If this usage code is excluded, then you can define maintenance related bookings or functions so that the space is booked without turning on the HVAC for that area.
This list is dynamic, but some examples are shown here: