As of the FroYo update, none of the "standard" intents for invoking the Calendar seem to work on the Droid X. I'm hoping that someone out there has figured out the right App/Activity pair to pull up the calendar, ideally in Agenda view.
You don't need to tell me that this is outside of the official Android API, and thus not an appropriate action to take. I know this, and I'll gladly use the documented API as soon as one exists. In the meantime I'm interested in providing my users the capabilities they need, even if that means going with expedience over official correctness.