The age old question... what's the vibe so I can dress appropriately and fit in? My #1 priority is that you are comfortable. Its going to be hot, and outside. Aside from that, think backyard barbecue. Sundresses, khakis, ect. or have fun and get all dressed up and look super cute, but bring a change of clothes so they're there if you want them! (that's what I'll be doing)