When you log into your account, you may not have access to the event you want to join.
Several reasons can explain this :
1) You have not yet registered for the event. Perhaps your registration is not complete, remember to check that you have received a registration confirmation and if this is the case, fill the form through the following link so that we can help you.
2) You did not log in with the email used when registering for your event. Make sure to use the same email address when connecting to the application.
3) The event is not yet accessible to users. It will be when the invitation emails are sent by the event organizer.