adding attendees for one instance on a recurring calendar invite
 

Hi. Have set up a recurring calendar invite to a core group of people. Each
week we need to invite people only for that session and use the "open this
occurance" vs. the 'open the series'. Then I add the names for that one time
only and send out the updated invite. BUT...the folks added to the one time
only are made part of the series invite. So the following time the next
session comes up and a different group is invited for that one time only, the
folks from the previous one time only are still in there now as part of the
permanent invitee list. Is there a way to avoid having temporary folks
become part of the permanent list? Thanks in advance!