But an hour later, the fully COVID-19-vaccinated 59-year-old from Jefferson Park was barefaced and merrily strolling through the crowd of about 70 other fully inoculated people as her favorite music genre — house — blared from the speakers. Hardly a mask was in sight among the audience, which was mostly seated or waiting for beverages. Some, though, got up and shuffled side-to-side in front of the white stage.