We just walked it the first week of June. It was beautiful, but hot as hell! Also, we did it during the daytime and I don't recall seeing any lights (though they may be there), so I wouldn't count on being able to return after the Hoop De Doo.
The absolute best way to get to Fort Wilderness for the Hoop De Doo from the Wilderness Lodge is to TAKE THE BOAT!
Oh, and it's not a short walk, either. I'd say more like 20 to 30 minutes.