Several beta users have asked for an album or gallery view that shows photos and videos taken on the current day, or the current week, but from previous years.
(Google Photos does notifications when these are available: I’m normally opposed to notifications, but if they’re coming from your own library, and they’re opt-in, not opt-out, it seems like this wouldn’t be noxious)
I can’t wait for you to mark some items as done so I can get some votes back and vote for this one!
Are users specifically asking for a notification? I’d be perfectly happy with an album that I can click into whenever I want that shows “On This Day (or week)” for previous years. With that said, I’m not opposed to a notification as long as it can be disabled!
The most important user I’ve got: my wife 
Can’t argue with that!!