I maintain a Google calendar entitled “Information Security Conferences, Workshops, and Training”, and it contains dates for conferences, workshops, training, CFP deadlines, and related events. I inadvertently announced it to the InfoSec research community by way of a response to a recent post on the Daily Dave email list asking about such a calendar. Since then I’ve had a flood of responses suggesting additional events to add as well as a lot of positive feedback from people who are now subscribed to the calendar. I believe it’s probably now the most comprehensive calendar for the subject available. I previously maintained the calendar just for myself and a few friends’ personal use, but apparently people are finding it extremely useful.
You can view or subscribe to the calendar via HTML, iCal, or XML.