Stupid Question - Bulk Update Contact Permissions

We've just sent out our gala invitations and we've started to receive a good deal of them back because of wrong addresses etc. Last year we went through updating the contact permissions for each person we got a return-to-sender invite from. Obviously, this was a huge undertaking and took our whole development team weeks to complete. Is there a way to bulk update the contact permissions for a list of constituents? My team and I would love an alternative to updating individual records for a month.