1. Go to evenium.com 
2. Click My Events
3. Click the name of the event under the I organize section. 
4. Click to the Participants tab located on the purple bar
5. Click on the Export button at the top
6. Select Choose columns to export. Include columns Status - [Session name] for the desired sessions

If you want to get registration information for all sessions:

1. Click on the Import button
2. Download the Session registrations per participant (export) template. 

This is typically used to modify session registrations, but the template will give you current registration status for all participants on all sessions.