Answer: Yes, you can ask the owner of that calendar to change delegation preferences. In Outlook 2010, go to File > Account Settings > Delegate Access (in Outlook 2007 it is found under Tools > Options > Delegates) and select your name if listed (if not, add it). Then click Permissions. Under the Calendar permissions uncheck "Delegate receives copies of meeting-related messages sent to me."
On the Mac you go to Tools > Accounts > Advanced button, click the Delegates tab and select your name and click the Set Permissions icon (lower right of delegate list window), and uncheck "Delegate receives meeting invites."