Hi Viv–
This idea has been bounced around but hasn’t got a lot of traction. The two best solutions today are to create a custom type (which won’t go into Meeting Guide) or to just use the notes.
I’ll save you from having to read my brilliant opinions ?? about meeting types but suffice to say I’m hoping to move TC out of the meeting types and into some sort of status or closure field. It may be possible to add something like “Outside” as the alternate meeting location at that time, but so far we’ve got higher priorities, which I’m hoping to get back focusing on later this week.
If you feel strongly about this, I suggest coming over the dev site and opening a new feature request.