The Calendar allows you to maintain your own personal calendar of events as well as view a System-wide global calendar and shared group calendars. The calendar has some very useful features:
You can set reminders to be automatically e-mailed to them as an event approaches. In addition, if you have a text message device such as a cell phone can have these reminders sent to your phone.
When there are events added to the General Calendar you may receive invitations and reminders for them.
Integration with the Special Interest Groups module allows a shared calendar for a specific group of users.
Remind me! Links
This allows you to place, on any web page, a “Remind me of this event” link, which will let the you easily create a reminder for that event.