Frequently, I have days where I'm out of the office attending day-long meetings where I'm unable to work on my regular tasks. It occurred to me today that it would be nice to be able to go into my TD calendar and block out those dates, just like I do on my "real" calendar, so that if I try to schedule tasks during or spanning that time period, I'd get a warning message telling me that I'm scheduling working on a task when I'm not available to do so. I could either reschedule, or override (maybe it's something I can work on during the meeting or at breaks).