Edit the event:

Example: 

acronym: GriCal
title: GridCalendar presentation
startdate: 2010-12-29
starttime: 10:00
enddate: 2010-12-30
endtime: 18:00
timezone: Europe/Berlin
city: Berlin
country: DE
address: Gleimstr. 6, Berlin 10439, Germany
exact: True
coordinates: 52.55247, 13.40364
tags: calendar software open-source gridmind gridcalendar
urls:
    code    http://example.com
    web    http://example.org
dates:
    2009-11-01    visitor tickets
    2010-10-01    call for papers
sessions:
    2010-12-29    10:00-11:00    first presentation
    2010-12-29    15:00-16:00    second presentation
    2010-12-30    15:00-16:00    third presentation
description:
GridCalendar will be presented