The 'maximum appointments per student per parent' option
The Maximum appointments per student per parent option can be set when creating a new parent's evening in the Evenings > Add Evening page to restrict the number of appointments a parent can make in respect of a student. It is useful where students are taught by a large number of teachers and the logistics and timings of an evening mean that not all parents could see all teachers. It is not used to stop appointments being made on multiple dates on an evening, that is done by default as long as you set the evening up with multiple dates.
For example: a secondary school which has 9 classes for a student. When a parent logs in with this option set to No Limit, they can book all 9 teachers for that student. If you set the limit to 5, the parent will be able to book a maximum of 5 appointments with that student's teachers (if the parent has several students involved in an evening they would be able to book up to 5 bookings for each student.). Once the limit has been reached the system informs them of this.