As we get closer to Summerfest, officials announced yesterday that all people on site will need to prove that they've either been vaccinated or have tested negative for COVID-19.
Their Instagram lays out the specifics, "COVID-19 vaccination or negative COVID-19 test result will be required to attend Summerfest 2021, including the Wednesday Weekend Preview concerts held at the American Family Amphitheater. Patrons who are not fully vaccinated will need a negative COVID-19 test result obtained within 72 hours prior to attending the festival. Children under 12 will be required to wear a mask."
Summerfest launches on September 2nd and runs three consecutive weekends.