Yes. The ceremony, cocktail hour, and dinner will be held outside. There is however, a reception tent that dinner will be served under that has some "temperature regulation" - it is not full blown A/C but there is a cooling system to an extent. There is also Curtis Hall that guests will have access to. It is an indoor concert hall with A/C (also where restrooms are located) where everyone can congregate and dance after dinner. You can also go inside to take a break if the heat is too much at any point throughout the evening.
Yes, transportation will be provided and there will be more than enough room for everyone to spread out. The buses will be departing the Doubletree Suites at 4:30PM and returning at 10:45PM.