When I receive an invitation from someone else to accept a calendared item
they have sent to me, in the past I have just accepted and it went into my
calendar.  I now have more than one calendar to maintain for different
purposes.  (Don't ask).  

How do I determine which calendar the acceptance will apply itself.  I tried
to drag the acceptance to one of the calendars, but that did not seem to
work.  There must be some way to maintain more than one calendar.

Thank you.