If you are smart and prepare properly, it will be an incredible experience for you, and for your child to look back on later in life. My son is now 4 and loves looking at the photos and video from that time.
We brought our son when he was 8 months old, and not only did he have a blast, we enjoyed spending time with him, watching him play and smile while our fav bands were on. He slept like a baby should right through My Bloody Valentine thanks his Peltor earmuffs.
Don't worry about what the morons on here say, plan accordingly with your child's safety in mind, and do it. Trust me, it'll be worth it.