Here is how you add an event to the calendar:
Navigate to the "Plan" tab in the left sidebar menu.
Choose the project you want to add an event for by selecting it from the "DISPLAY PROJECT(S)" drop-down list to the left of the calendar.
You will then see a blue "Create Event" button appear in the upper right corner of the screen. Click it to create the event.
Your Ivy calendar can also integrate with an external calendar. Also, if you get your emails on your phone, you'll receive all your notifications from your Ivy calendar to your email, so you'll get those on the go.