Beware of stinking Facebook when you upgrade! It will take over your Calendar and Contacts leaving entries you cannot delete! Go into Settings > Facebook > and switch off Calendar and Contacts. Thanks to Utilitap, maker of Week Calendar, and their VERY fast query responses, I hadn't broken too many glasses!
After it all, I still hate Facebook! Before I had the answers, I tried to delete the errant entries which was impossible! Then I tried to delete Facebook, and it decided I was a hacker, so it blocked me from killing it! As soon as I fixed the problem, I went back to Facebook, AND I KILLED THE HATEFUL THING! Now I feel better! Time to sweep up the glass!