I frequently use my calendar to put in reminders or appointments that I do not necessarily need smart actions to do anything. There are other times that I do want smart actions to silence the phone or do something else. There are other task managers that allow you to trigger on a calendar event that is marked as "busy". In the current version of smart actions you only have 3 choices that deal with all day events, multiple people or meetings accepted. It would be nice to have a choice of "Only events marked as busy". Thanks!