Among other benefits, the Diplomat feat from Unearthed Arcana: Feats for Skills allows you to make a contested Persuasion check to charm a creature:
If you spend 1 minute talking to someone who can understand what you say [...] If your check succeeds, the target is charmed by you as long as it remains within 60 feet of you and for 1 minute thereafter.
How should this take effect if I am talking to a group of individuals? Can I charm several creatures at once, or only one target at a time?
It feels like it might be the DM's call, but I was curious whether there is any official ruling on this.