Notes

Notes can be entered for people when rostering them for an event by clicking theicon on the 'Update Roster' page.
These notes will appear under the 'People' section of the event's details page. 

Anyone viewing the event with 'View all' access to the event will be able to see these notes, along with the person in charge of your staff at the event.
Personal / confidential information should not be entered here, instead a note instructing event organisers to "Refer to personal details", or "Refer to manager before the event" should be entered here.

Notes can be entered into a persons details which will then appear whenever that person is rostered to an event.
To do this, edit the person's details page, and add your desired notes to the 'Roster Notes' section.
For example, on John Smith's page, the following note is added:

Now, whenever this person is rostered to an event, "Does not have a car" will appear within the notes next to his name on the roster.

Please note that anyone with 'View all' access to event details will be able to view these notes, and as such, sensitive or private information should not be stored here.
It might be best to include a note "Refer to personal details", or "Refer to manager before the event" if any personal information needs to be passed along. The person in charge of your staff at the event will also have access to the roster notes.