Wondering if any of you have gone to a large music festival or similar event during your pregnancy, and if so, how awful and uncomfortable was it? How far along were you?

DH and I are going to start TTC this year, and the thought of going to Lollapalooza and Pitchfork while pregnant sounds awful - port-a-potties, limited seating, hot weather, tons of walking - but we're not sure we want to push our timeline back so far to avoid festival season completely. So, is it as terrible as I'm imagining?