I've started using Google Calendar properly and it's changed my life. There are so many things you can do with it that it makes no sense to NOT use it.
I add all my meetings, calls, appointments, etc. to it now and am always excited when I can just *CLICK* to add something to my calendar. Eventbrite let's you do this as well as a lot of other services I use.
It adds all of the details to my calendar and I can set up how I want to receive my reminders. I generally use email AND text reminders. Email reminders a day before so I can make sure I've done all I need to do for the event and text reminders starting 30 minutes out.
Another feature is the ability to share my calendar with the Robinator. Both of us use this feature so we're not doublebooking things we need the other for and we can make arrangements for Lucy, etc. His events are in blue, my events are in pink.
I receive a daily agenda (can be found in 'SETTINGS') every morning at 5:00am so it's the first thing I check when I look at my emails daily.
I can even insert/embed meeting information in an email so that the recipient can one click add it to their calandar as well.
Are YOU using it?