Start a meeting with a Tagged group of people
We're already able to separate teams out using Tags, but this is only any good for @mentioning. It would be good to be able to @mention the Tags when setting up a meeting or a group chat, to quickly focus on a large number of people. It is the equivalent of creating a distribution list.
Sometimes we want to maintain open Channels for the whole team, but only focus the conversation on a subset of members.