zwoelf: there are two problems with your ICAL object that I can see 
initially:  
   
 1. DTEND:200610209T200054Z is an invalid timestamp.  You've got too many 
characters in the date portion of the field.  libical barfs on this, 
telling us "X-LIC-ERROR;X-LIC-ERRORTYPE=VALUE-PARSE-ERROR:Can't parse as 
DATE-TIME value in DTEND property. Removing entire property: 
200610209T200054Z".  
   
 2. The string "Go, eat fish with Florian" is also illegal.  The comma 
needs to be escaped with a backslash.  

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