It would be hard to compare Tomahawk and Sturgis. Lately Sturgis has been starting a week or two before actual Sturgis Week, and lasting a week after. There were at least 14 fatalities connected to Sturgis, but the number could be even higher. If you leave New York City for Sturgis, and have a accident in New Jersey, it won`t be labeled as a Sturgis accident. And the crowd for the week bebore and week after Stugis is easily over 100,000, and spans more then just one city or town.
I`ve been riding a motorcycle for a long time, and nothing adds more to your chance of having a mishap more then night riding and drinking.