Is it possible to delete my Facebook account and not lose the info synced to my Evo?
Assuming your phones calendar is syncing with a Google Calendar, then the easiest way to do this may be to export your friends' birthday info from Facebook and import it into Google Calendar.

Our sister-site Web Applications has more info on doing this:


How do you extract friends' birthday and contact information from Facebook?
Import birthdays of friends from Facebook into Google Calendar?