Event variables can be used on the calendar day page's events area, or in toplists of events.

{EVENTTITLE} - The title of the event.
{EVENTDESCRIPTION} - A description of the event.
-- Optional parameter: number of characters.
{EVENTSTARTDATE} - The date when the event begins.
{EVENTENDDATE} - The date when the event ends.
{EVENTBEGINSTIME} - The time when the event begins.
{EVENTFINISHESTIME} - The time when the event ends.
{EVENTINFUTURE} - True if the event has not yet happened.
{EVENTTHERE} - True if the viewer has joined the event.
{EVENTJOINEDLIST} - A list of the people who have joined.
-- Optional parameter: template of how it should be displayed. Default is <a href="memberlist.php?action=profile&id={MEMBERID}" class="{MEMBERGROUPNAMESTYLE}">{MEMBERNAME}</a>
{EVENTCANEDIT} - True if the viewer can edit the event.
{EVENTCANDELETE} - True if the viewer can delete the event.
{EVENTVALIDATED} - True if the event has been approved.
{EVENTOWNERID} - The id of the member who owns (created) the event.
{EVENTADDEDDATE} - The date/time when the event was added to the calendar (not related to when the event takes place).

All the member template variables can also be used , in this context they'll show information about the owner of the event.