Thank you, Rick and Andrew. All important points.  I've just split the campaign into two.  -- Tim        Rick A.  said:   I would be concerned that  the actions of one group would affect the other.  In my game the PCs sometimes revisit a location, so I need to keep a record of anything that they did to alter that location, like NPCs that are no longer present, new NPCs introduced, buildings or other objects altered, etc.. If I would be running more than one group, I would need to maintain both the altered and the original versions. That can get out of hand in a hurry. Keeping separate  games keeps the bookkeeping simpler. Account space isn't an issue because all of your games share the same art library.              Andrew R.  said:   I ran a  13th Age 2e  play test where I used the same game for 2 groups of players, Americas & Oceania. I would  not  do it that way again, I’d use 2 games instead.  It wasn’t the battle maps that were the problem, Map Folders made that a breeze. It was Scheduling the next session, which the Players found irritating & confusing.