I decided to investigate and I don't think this is for HHN (Orlando atleast) after all. It is definitely for a haunt but, some things don't add up for this to be HHN:O. Our event definitively starts on the 23rd (for GP;EP 22nd). If you look on the hours for Universal the first night the parks close early is the 23rd. Where as the first night Brushwood has listed is the 29th. In theory there still could be a Freakshow featuring Brushwood but I don't think he would turn down a major contract like HHNO, especially since there are more nights for him to perform and there for get paid.
I was bored, I had time. I decided to do some research and maybe find out what Haunt Brushwood might be at. So here is the list of MAJOR haunts. I know there are smaller, more regional haunts but these are the big American players.
HHN:H, inconclusive. There website does not have as indicative hours. Making it harder to decipher dates.
Howl-O-Scream: Tampa, inconclusive. They list closing time for every day in Sept and Oct as 6pm.
Howl-O-Scream: Williamsburg, unlikely. Their event starts the same date as HHN Orlando. Which is probably the same date as HOS Tampa.
Knotts, unlikely. They don't have their hours listed but typically their event starts significantly earlier than the others. Usually in mid-September.
Six Flags Magic Mountain, definitely not. No hours are listed on those dates.
Cedar Point, plausible. There is some plausibility on this one. Their haunt event starts the 30th and Brushwood would need to be there the 29th. I don't know if they have any sort of an EP if they do then this is likely. For anyone who has worked at Cedar Point in recent years do they have an Employee Preview for their haunt event?
This also brings me to my next point what the nights might be for HHN. From what I can tell from years past and from what the September hours alone are showing here are the dates.
What we're looking at is 24-26 nights and that is including employee preview.
September: 22nd(EP), 23rd (opening Friday), 24th, 29th, 30th.
October:1st, 2nd, 6th, 7th, 8th, 9th, 13th, 14th, 15th, 16th, 19th(?), 20th, 21st, 22nd, 23rd, 26th, 27th, 28th, 29th, 30th, 31st.