Help Things added to my calendar that I didn't put there

[jodie66]

Just started playing with my tablet. I'm a novice but noticed that my daughter's birthday was on there and I did not add it. Is there any explanation for this?

 

[GTWalling]

Facebook may have added it.

 

[Unforgiven]

Android via Google aggregates a lot of your information. If you entered it in your online Google calendar, put it in FB or G+, or other places it may end up there.