You are able to view your own registrations by going to "My Activity" and clicking "Registrations."
To view more details about any event you have registered for, click under the far right drop down next to the event name and choose "View Details." You can also use this to message the organizer or to add an impact for this event (choosing to add an impact from here will automatically populate the event and group).
You can also see your registrations on your Dashboard. If you would like to see a calendar view of your upcoming registrations, go to the upper right corner and click "Hi [Name]", then "Dashboard." A calendar view is visible on the dashboard to help you organize upcoming volunteer opportunities.