I was there last Halloween night. It was sold out, but it did not sell out until the first week of October. It was not that crowded in my opinion. Ride waits were non-existent, even for Haunted Mansion. The parade route was pretty crowded, but fireworks viewing was easy to get a good spot at the back of the hub. In a word, it was AWESOME! They don't let as many people into the parties as the park would be at capacity (Christmas). I highly recommend it!