At the bottom of the Overview screen you'll find your News and Events feeds. (You can also find News and Events in your Account screen.) Your manager or employer can use the News feed to circulate important information in individual posts. Events are created with a date and time, and give you the ability to confirm your attendance if this feature has been enabled by the event's creator. If there is more than one news feed post or event you can swipe left and right to view them, or tap See all to see a full list. Tap on the post or event to see more details.
When you've selected an event you can see a list of your colleagues that are attending or have declined, and confirm your own attendance too.