Zoho Google Calendar

Zoho Google Calendar

I've synced my google calendar with my zoho one. I work with clients who need to get the event invite through google only but when i edit the event in zoho (tie it to a contact or potential)(something they don't need to know about) it automatically sends a second invite to the people i've already invited through google.

Is there a setting to turn off email notifications through zoho calendar?

I also receive invites through google and they transfer to zoho as events I still need to accept or decline in my cue. When i accept it sends a second confirmation to my clients. they don't need to know this!! How can I limit all these emails? 

Thanks,
Laurel