Activity for Leah

I am planning an outdoor wedding in Las Vegas. The date is set for September 14th. My question is about the heat because I want to have a morning wedding, 10am to be exact. Is this a reasonable idea or will my groom and guests just be way too hot?

Ok I need advice...I got a Beautiful dress for an amazing price but because we are trying to get pregnant I need to have a corset added to the bodice because as of right now it fits like a glove. It is a mermaid gown with a beaded lace overlay....