Where did my calendar events go?

My Calendar App on my Iphone is linked to my Yahoo account. The iphone calendar went blank last night. My Yahoo account calendar is also wiped out! I've been to the Apple Store, they tell me it's not the phone.

  • Why does iPhone automatically delete calendar events from months ago? And how do I make it stop? I use my iPhone calendar a lot and sometimes I rely on it by scrolling to previous months to see when I went for certain appts but it automatically deletes last events without asking? I know I can make special events like bdays repeat weekly or yearly but some events don't require that function, I just want to know when I went to my appts for example, what day and time it was my dentist appt. Can anyone help?
  • Why did my iPhone delete all of my calendar entries? Yesterday afternoon, I sync my iPhone to my computer and let it backup. All my dates were there on the phone (while it was plugged in). This morning, I look to see why my phone hadn't alerted me for work. It turns out that all of my entries (except for birthday associated with contacts) have disappeared! Can someone tell me what went wrong and how to get them back?
  • Why are alerts not happening for calendar events in my iPhone. Alert is set for Time of event - yet there are never happening? Why are alerts not happening for calendar events in my iPhone. Alert is set for "Time of event" - yet there are never happening?
  • What to stay on top of current events? So I really want to stay on top of current events- political, local, national, Etc. Right now I just keep up ksl.com, a local news station, on my iPhone. I check it daily but still manage to miss out on news and I don't understand. I'm a republican, so I'd prefer something not very liberal sided but a little bit is ok. How can I stay updated?