Des Moines Register: As coronavirus cases rise across Iowa and the United States, event promoters and performers increasingly are asking for stepped-up precautions, including mask wearing, proof of vaccination and a negative COVID-19 test. “Everything is fluid right now,” said Chris Connolly, general manager of the Iowa Events Center. “It’s case by case at this point.” Officials at Des Moines Performing Arts say the same is true at the Civic Center in downtown Des Moines.