Custom iCal field values

[masterchef]

Hello,
In my application event description contains characters that break the calendar event and it does not get loaded in iCal. How can I modify the field values before they are exported as .ics file?

Sample event that breaks:
BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//iCalendar export//EN
BEGIN:VEVENT
UID:[email protected]
SUMMARY:IV MEDITECH 2014
DESCRIPTION:BOGOTA, COLOMBIA - BOGOTA'S INTERNATIONAL HEALTH FAIR 2014

The International Business and Exhibition Center of Bogota – Corferias, and the Colombian Association of Hospitals and Clinics – ACHC, with the support of the Colombian Dental Federation welcome you to IV Meditech and III Odontotech. 

In its previous version in 2012, MEDITECH received 254 exhibitors, 13.717 visitors on 7.329 m2 of exhibition area. It is the most important event for the health sector in Colombia, and an ideal place to market, promote or launch your brand. It will also enable visitors to strengthen existing business contacts as well as establishing new ones. 

LOCATION:BOGOTA- CORFERIAS
URL:https://www.wtca.org/calendar/events/iv-meditech-2014--2
STATUS:CONFIRMED
CLASS:PUBLIC
DTSTART:20140812T080000Z
DTEND:20140815T200000Z
DTSTAMP:20140812T080000Z
END:VEVENT
END:VCALENDAR

  are character sequence that breaks the invite.

Thanks