I dunno if there's a tile arrangement that would enable this, but if you had two adjacent spaces, each containing a different type of location, and you have the Eyebot (which lets you do encounters as if you were in an adjacent space), could you do an encounter in each space in the same turn?
I've found two relevant bits in the rules:
Page 3, Actions
QuoteA survivor can perform the same action more than once during his or her turn, except for the encounter action.
Page 5, Encounter Action
QuoteA survivor can perform this action at each encounter icon no more than once per turn.
The second seems to suggest it's the location icon that's limiting you to one per turn, so I'm not sure.
Edited by mazz0