Do participants get to see the email addresses of other participants?
Email addresses of participants are not visible to other participants.
They can see each other's name in the event, unless you disable this. You can do this by hiding the participants from each other during the creation of an event. You can do this in the Who-step on the page 'Who do you want to invite?':
Now, participants cannot see which other participants are in the event. This also eliminates the chat function in the event.