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This is a limitation of iCal; it won't let you sync to-dos over without tying them to one of the calendars. Since projects come and go as you complete them, but contexts tend to stick around longer, we figured it was better to map them onto your calendars. (That prevents you from needing to tie each new project to a calendar when you create it.)

The easiest thing to do here is probably just to make a "To Do" calendar, then tie all your contexts to it. That'll let you sync your items without adding them to your "real" calendars.

Hope this helps!