Some quick background:
- When someone donates, they always receive an email from Pledgeling Foundation confirming their donation -- this is for their tax records.
- When an invited guest donates, the other people that have RSVP'd get notified. No dollar amount is shown to those guests.
- When an invited guest donates, the event host also receives an email, but this one does show the donation amount.
Each person can control what emails are sent to them by going to the settings tab on the event page, shown below. If you uncheck the middle "Notify me of event activity …" box, you should stop receiving emails about donations.