@breversa As you can see in the logs, the VEVENT is uploaded by DAVdroid correctly:

2016-08-09 12:45:59 11 [HttpClient$1] BEGIN:VCALENDAR VERSION:2.0 PRODID:+//IDN bitfire.at//DAVdroid/1.2.2-ose ical4android ical4j/2.x BEGIN:VEVENT … SUMMARY:Fête de la bière 🍻 STATUS:CONFIRMED BEGIN:VALARM … END:VALARM END:VEVENT BEGIN:VTIMEZONE … END:VTIMEZONE END:VCALENDAR

I’m quite sure it’s the mentioned MySQL problem.