I am headed down to Universal Orlando Sep 20-22 and am purchasing my two day park hoppers. A few sites have discounted tickets that tie you into the Friday (21 Sept) HHN date, however I was thinking it may be smarter to purchase my Stay and Scream pass when I arrive just incase the weather calls for terrible rain friday but excellent weather saturday. Is there any chance I'll get down there and HHN will be sold out for either night?