Ok i just got it to work using the method i posted above.
1) On your PC, Google "Silent MP3". Download any silent MP3 you find.
2) Connect your phone to your PC using the USB cable and select "Disk Drive"
3) On your SDcard, place the silent MP3 in Media > Audio > notifications
4) Disconnect your phone
5) Open app drawer and select calendar
6) Menu > More > Settings > Reminder Settings > Select Ringtone > Select the silent mp3 you placed on your SDcard.
Cheers!