Allow certain contacts to ring when phone on silent/night mode? My WinPhone had this feature to set my phone silent at fixed hours of the night, but whitelist certain contacts for calls/texts.

I've recently switched to Android (OnePlus3) and while I'm sure this must be possible (iOS does it too IIRC) I can't see what its called or where to configure it.

Can someone tell me what these features are called on Android?

My phone is running OxygenOS 3.2.8 atop of Android 6.0.1
look at your settings for Do not disturb mode.
it will make your phone silent for everything, except your favorites contacts.