A facility/tool manager may want to notify users about activity that will be happening in a lab on a certain day. For example, if there is construction, cleaning, a tour, or some other short-term event that may impact the lab space but will not actively shut down the tool(s). There is no real problem using a tool/lab if someone is changing the lightbulbs in the lab, but users should be aware that someone will be in there moving a ladder around.
It would be nice to be able to put a notification on the calendar that is not an outage, but just a note to users that something is going on.