I have used Jevents on my Joomla sites for event management, registration and reminders. The extension is very powerful and I would strongly recommend becoming a Gold Member to access the RSVP Pro plug in that enables members to register to attend and be reminded of your events.
The support from Geraint and gwesystems is second to none. I have received assistance and even custom functionality to meet my needs. This is a fantastic Joomla! extension and I highly recommend it for your calendar and event needs