Peter (M3PHP) and myself have spent a few days putting together an interactive Ham Radio Calendar.
Not sure how useful or popular it will be but is live over at http://www.cal.prettygoodprojects.com
At this moment in time there aren’t many contests on it, but we hope that will change soon. Also new events currently need manual approving, but this is to prevent spam.
If you wish to actively help you can sign up and we could let you approve your own events.
Enough of my typing, go check it out now, and see you in the pile-ups!