The wedding is in Michigan in September when the average tempature is low-mid 70's. I am able to get black chairs that are plastic but supportive for free but im just wondering how much of an issue the color black will be for the guests. The ceremony is going to be about 20 minutes long and I have provided an individual paper fan and bottled water to keep guests cool. The reception is indoors at a seperate location so this is just for the ceremony! Should I pay for light colored chairs that might not get as hot or should i use the black ones that are free?