Blue,
I have moved hives many times between my neighbor house and mine and from one side of my yard to the other. The trick is to put something in front of the hive to block their flight path. I use a palm frond. Do it at night like you mentioned. The blocked flight forces them to reorient to the new location. Bees will still go back to the old location, especially the ones that spent the night in the field. The older field bees will also go back to the old location by habit. Place a hive box with empty frames in it at the old location in the evening, at so set, put the box on top of the hive. The following day watch the old location. You will probably have bees returning to it but they will go to the and then fly to the new location. If you have bees that just stay there then do the empty hive trick again. I have never had to do it more than two days.
The old field bees will probably continue to go to the old location first until they die. When I have moved a hiv a few feet the old bees do a S pattern to make he old location and then to the new location for a couple of weeks.
Jim Altmiller