If enabled (see settings), EboBirthday will put up an icon in the notification bar whenever there are any events coming up soon ('soon' being the number of days as specified in the settings). Clicking on the notification will bring up EboBirthday. Clicking on 'Clear All Notifications' will silence the notification for one day, as will clicking on the notification unless persistent icons are enabled. If you really want the notification back right away, you can disable it in the settings, go back, then re-enable it.