One part of what makes virtual events hard is not being able to hear the interactions with a natural flow. There are awkward silences and delays and we often end up lacking feedback.
In most event scenarios we will want to ensure people are muted, however there are situations where unmuting adds to the value of an event:
a collection cheer / noise / chant / participation / ritual
a collective and clearly communicated unmuting period to create faster flowing interactions
use the side text chat as a way to facilitate flow