We always stay about 30 miles away in Rapid City. Campgrounds generally aren't too savory anymore. I think the crowds have overgrown the infrastructure. Overfilled port-a-potties and the like are rampant... doesn't matter if it's one of the big ones like Buffalo Chip or something smaller. If you show up a couple of days early, some of the locals have deals set up, either for a room or yard space. It's kind of hit or miss though.
Sturgis is a hoot!!! Bring plenty of money!!! One thing a lot of people don’t think about though is you also need to bring a mechanically sound bike... brand or type doesn't matter... and you have to be proficient in operating it at slow speeds and in large groups. Waayyyy too many yahoo's go buy a brand new bike, or rent one somewhere and end up bouncing off other people or causing wrecks because of their inability to operate it or they show up with a mechanics special and find themselves sitting alongside the road half the time with overheating issues.
There are numerous fantastic organized group rides and things to do and see. You might see R. Lee Ermey and get a chance to try out a new Victory, test ride a new Indian, numerous custom bike shows, nudity, debauchery, alcohol abuse and biker churches... take your pick or do them all!!!! Stay a couple of days afterwards and you'll have an opportunity to cruise some phenomenal roads and see some of America’s epic signature views.
So live your life that the fear of death can never enter your heart. Prepare a noble death song for the day when you go over the great divide.
Sing your death song and die like a hero going home.
"Every man's life ends the same way. It is only the details of how he lived and how he died that distinguish one man from another" Ernest Hemingway