It doesnt seem to mater to bikers going to Sturgis every year that the weather could be shitty. Remember last year there was
deluge early in the week that turn the campgrounds into a muddy quagmire. Maybe you can afford to be indoors this week.
Like the Knoxville Nationals this year, Sturgis will be during Mercury in Retrograde. The weather not good if your sleeping in
a tent. Other than that is trying to find a parking place for your bike. Could be other problems that occur in Sturgis this week.
7-Day Forecast 44.41N 103.51W (weather.gov)
If you are in a horror movie, you make bad decisions, its what you do.