The only other thing I would suggest is a tent. You may need it anyway. It's been 90*+ here since the middle of May. Add that with the humidity in this town and your guests will be miserable.
It's usually in the mid to upper 80's around 730 in the evening here. By 1130, it is still in the upper 70's. The humidity here is so thick, you can eat it with a fork. Example: I went to an outdoor wedding last month. It started at 630 with the reception directly after. By 730, a noticable amount of people had left. By 800, more than half of the guests had left. When we left at 830, there was mostly only family left. Everyone was miserable. The bride's hair had to be fixed twice because she was sweating so badly. They had to cut the cake before dinner was over because it had started to melt. I would have a tent that, if not air conditioned, at least has fans.