You can quickly add someone new to a meeting with:
/gonebusy add @mandy to Weekly Check-in 

If more than one meeting matches the name you provided, you will be offered a dropdown to a select the appropriate meeting.

Likewise, you can remove someone from a meeting with:
/gonebusy remove @jody from Board of Directors

NOTE – this will add/remove from ALL instances of a Recurring meeting.  We will be adding support for instances of a recurring meeting soon.

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