There is just a report from the USA that around 250,000 visitors to the largest Harley meeting in the world with 500,000 visitors are said to have been infected. However, this report has already been sharply criticized; the studio is based on anonymized cell phone data. Governor Kristi Noem says it has no scientific basis and is just fiction.
It's difficult to judge what's really going on; ultimately it's about infections, not about sick visitors. According to Johns Hopkins University, more than 6.3 million people in the USA have been infected with the coronavirus so far.