Team Calendars are great! But they would be awesome if they provided what is now expected functionality for any calendar system - Reminder Notifications!

Unless reminder notifications are implemented, it will be up to individuals to continually review their multiple calendars in Confluence to know when events are happening. This is not practical and for many would ultimately mean that it is not practical to put important information into Team Calendars, especailly those events which you MUST recieve a reminder about so you don't forget them.

The implementation options for this are various, but I don't think anything fancy is required. Maybe each event can have a specific reminder option where people and a time can be assigned and an email is sent to those people when that event time period occurs. To improve upon this, an entire calendar reminder option would be nice where you could set up your own calendar reminder which sent you a personal email based on your preference for when you wanted to be notified, about how far into the future of the Calendar and how frequently.
eg. Reminder for MRoff - Birthday Calendar - Remind me Weekly about all events coming in the next two weeks