Are you talking about and island calendar not connected to your e.g. sales table? Or a master calendar?
I think (without knowing too much about your data model(s)), using a single QVD for a master calendar should be possible. Though, I think it wouldn't change much, except maybe removing some redundant files from the disk.
I enclosed my QV Doc , which have many tab , and data table very messy.
My concern now is if i break out the QV doc into few QV doc , so each QV Doc will have their master calendar.
when i try to combine all QV doc into one , i worry when all master calendar combine into one , i am not sure will cause any issue ?
( By the way i still remember you have help me solution one of my qyestion posted related to using QV for P&L ? Do you still remember ? , i alway remember you , because that was the most diffcuilt question which i encounter and solve by you.)