I am going to be at US/IOA in October. I have APs which I haven't activated yet and we are staying at the HRH. My question is will it be alright to purchase tickets to the HHN when we check into our rooms? We are checking in on 10-23 and hoping to attend HHN on 10-24 which is a Thursday. I read that if you have APs that you will only have to pay $19.95 per HHN ticket. Do you think tickets will be sold out for that night? Is HHN that popular that I need to worry whether I'm going to be able to buy tickets to it? 
