Invite who you want in group calendars

Hi Ethan Li, 

I tried the Brownbag-style and it works but only if the event is one day. For instance, I want to be able to add my vacation on the group calendar but with only my manager as the attendee. When I take vacation, lets say Fri-Mon - this ability to only add selective attendees doesn't work. 

Is there a reason for this? How might I work around this?

Thanks!