Altering a Repeating Entry

  Repeating entries are Calendar entries that are made on one
  occasion and then automatically repeated at regular intervals
  (for example, every week).

  If you attempt to modify or delete one of these entries, you
  must decide whether you want to affect this one occasion (as
  if it were a single event) or every such occasion from now on.

  You can also modify individual occurrences.  This is useful
  if, for example, you are looking at a day in the future that
  contains a repeat entry and you decide to make a change.
  Instead of returning to the first occurrence of the entry, you
  can modify a future entry by using the Entry Editor.  When
  you exit from the Entry Editor, a dialog box asks you whether
  you want the changes you made to be applied in:

  -   Just this instance

  -   This and all future instances

  -   All instances, past, present, and future

  Additional topics:

  *   Setting a Repeat Interval for an Entry or Day Note