Yes the night club card kicks in Jan 2nd through end of season, any night after 4-10 and starting at 3 on Sunday's, all three resorts.
back in 2011 I had a night season pass(I lived in Martinsburg, 25 miles to Whitetail) and that year it was better to have the season pass because season started around nov 22nd
now being back in NC, I am going to try the night club card, looks like if I go 5 nights it has paid for itself, if it works out next year I will buy it under the early bird special before end of October.