Event types can be customised by an admin user through the Account > Codes menu. For more information, see How can I customise system codes?
An event takes place at a date and time, for a given duration, and involves a Personnel and/or a Location. Events are used for meal breaks, meetings, leave, etc. They play an important role by blocking off time in the Calendar for Personnel and Locations.
By creating an event for a specific Personnel will prevent that person from being booked into an apointment during that period. Likewise the use of a room (Location) can also be blocked off.
To find out when an event was created, check the History.
To find out who created an event, check the History.