The call-to-meeting rate is the number of people who accept an invitation to attend a meeting, divided by the total number of people who are invited. This metric is important because it allows you to gauge how effective your invitations are in getting people to actually attend the meeting. If your call-to-meeting rate is low, it could mean that your invitations are not clear or compelling enough. Alternatively, it could also mean that the time or location of the meeting is not convenient for potential attendees. Improving your call-to-meeting rate can be done by making sure that your invitations are well-written and attention-grabbing.