We have a trip planned for the end of August but don't want to buy tickets until we know for sure the trip will happen. My biggest worry is a hurricane, followed by extreme heat. Last year we spent 3 days very anxious and then had our flights canceled due to a hurricane. I don't want to risk tying up $1000 in ticket credits. What's the absolute latest I can buy park tickets and make park reservations for the end of August? I'm hoping I'll be okay 2 weeks out.