Is it possible to set up my phone to automatically be in DND mode during particular calendar events? I already have a recurring scheduled DND set for my phone for every evening through morning. However, I have calendar events that I would like to automatically trigger DND. For example, let's say I have a meeting with a co-worker, I'd like to be able to enter that into my calendar and select a "DND" option for that time. So, once the event is over, my phone is back to normal, and I don't have to worry about silencing it myself. Is this possible?
Short answer… No.

There is no public API that manages the "Do Not Disturb" feature. There are also no frameworks that can achieve this.

Googling would also say it's not the kind of sandbox breakout Apple would be likely to allow in the future, either.