Can I extend the how long my event series runs?
Yes, if you've set up a series of events and now want to change the end date, you can extend the series. You'll need to do this via the task on the event details to 'Extend this series of events'. You will be asked when you want the new events to start from, and be give some options in the pop up box to set the recurrance.
You won't be able to extend a single event, only a series, so if your current event is a stand alone entry then you can use the current event as a template and set up a new series.