On my iPhone 4 ... Birthdays appear 6- 13 times on each calendar day. And I can't access the Birthday Calendar to delete the "extra" notifications! Please advise or help!!!

All I can tell you is to try and remove and replace all birthdays that you imput into the Contacts app. Also try disabling and re-enabling the calendar.

I just noticed this problem on my phone. Every one of my birthdays is multiplied about 30 times. It doesn't have a calendar icon next to the event so not part of any one calendar. Says it's part of my gmail calendar but if I hide that it still shows. Only if I hide my iCloud calendars as well do they disappear. Clicking on them doesn't give any edit options. Also says a contact has been invited and when I hit that it shows a huge email address with random numbers and letters @virtual.com - spam? I dunno. What's going on here!?

Make sure that facebook calenders is not syncing with your iphone. go into settings and turn that feature off. if not all of your facebook contacts calender info will be imported to your calenders.