We were at Brick or Treat this past Saturday, 10/10. It is not comparable to
MNSSHP. It is a nice event, considering it was included with park admission.
Brick or Treat is offered only on weekends. It is a small path down by the lake set up with about 10 trick or treat stands. They provide the trick or treat bags. Each stand gives out one type of candy (smarties, air heads, etc). Only kids receive candy, no candy for adults. Guests walk along the path and collect treats along the way. Each of the stand gives out about 2-3 pieces of candy. The path opens in the afternoon, it was 3:00-7:30pm when we were there. Some kids dressed up, but costumes are not necessary.
It is worthwhile going if you are there, but not worth a special trip just for that.