The steps to accept or reject an event invitation are:
1-. Enter user credentials. Once logged in, a screen like this will appear:

This screen shows the ability to enter into upcoming events as well as pending events, if there are any.
2-. Tap on the pending event
<aside> 💡 The main screen of the app shows the first 3 pending invitations, the rest can be seen from View all.
</aside>
The app will now display the following screen:

3-. Tap the Accept button to accept the event:

When the event is accepted, the app will show the following confirmation screen:

In the event that the event should not be accepted, tap the Decline button:
