Can any people see my event information and the profiles of attendees?

Attendees from other events will be able to see the title of the event and perhaps the description (if you make that available to them), but they will not be able to see the details or any other info for your event unless they have your invitation code for your event.

Sometimes, event organizers choose not to create an event invitation code and that is what controls whether or not others will be able to view the details.