South Dakota, had a spike after that event, which could have caused a change in your state's travel advice.
By memory you're in - Connecticut ??
Any traveler coming from a state that has a positive rate of 10 out of 100,000 people or a 10% or higher positivity rate must self-quarantine for 14 days. The traveler must have spent more than 24 hours in said state for the rule to apply. Everyone also needs to complete a travel health form.
Visitors can opt out of the 14-day quarantine in limited cases if they can provide proof that they have had a negative Covid-19 test in the past 72 hours.
There are currently 33 states — plus Puerto Rico and the US Virgin Islands — on the 10% or higher positivity list. The list is updated weekly. Check here for updates and details .. https://portal.ct.gov/Coronavirus/travel .