Silver members of the JEvents club can use the new and changed event notification plugin to send configurable email messages to selected groups of users when events are:

• Created,
• Changed, or
• Published/Unpublished

There are many config options to control which Joomla user groups, RSVP user types (attendees, invitees, remindees) who get the notifications.

Additionally there is a module that can be used by registered users of your site to request notifications oof new events falling into specified categories.