RE: rig on site
you mean a wireline unit? could be there for different reasons not just perforating.
running/pulling plug used to isolate the zones, getting a bottom hole pressure or pressure build up on a zone, etc.
no one around could mean pressure build up - coffee,lunch,meeting,?
rain or shine these guys work as long as they can get the equipment/materials required on the location.
Wireline unit could be there just because they could not get it off location.
Only way to know for sure is to be there. anything else is just quessing.