Big Easy Con responded to a comment on one of their Facebook posts and said Robert Englund has a previous commitment and wont be able to make the November date.
Englund is still doing LeftField Media's other cons, including Rose City Con (Portland OR) in mid-September.
Kinda spitballing here, but: With Big Easy Con the three days immediately after Halloween ... you gotta imagine that Englund has a bazillion Halloween-themed appearances in October up until Halloween. Cassandra Peterson (Elvira, Mistress of the Dark) has talked about this kind of Halloween-centric booking and how busy she gets and how it even bleeds into early November.
I would think it's similar for Englund as Freddie Krueger. He may either still be booked for a Halloween-ish gig November 1-3, or else he may simply need a break after a month-long grind of appearances.
Just a quirk of timing, it seems like. If Big Easy Con were a week or two later, Englund could probably make it. He is a frequent partner with LeftField, so maybe he'll make it down here another year in the near future.