Frontend for viewing group calendars
Currently (with Core and Chronos installed) there are three yes/no decisions: birthdays, holidays, personal events, lessons and supervisions.
While for the timetable there is a possibility to view the calendar (timetable) of a specific group, it is currently not possible to e.g. view all personal (custom) events of one or more specific groups.
For birthdays, it would be useful to be able to only view the birthdays of members of one or more selected groups.