Google Calendar Event Question

Every once in a while, someone in our office will create an event in Google. For some reason, everyone on the invite list will then receive an email alert whenever someone accepts or declines the invitation. I'm guessing that this is a setting specifically in the event creator's Settings in Gmail/Calendar, but have had no luck figuring it out or finding an answer online.

Anyone have any idea what to do to prevent this from happening? Thank you in advance.