VRChat Attendee's Guide for Large Events

All settings are available in the main (expanded) menu.

On the shield tab, set the "shield level" to normal":

On the cogwheel (settings) tab, in the Audio & Voice section, set tight limits for earmuffs to make it easier to hear the person you're talking to in noisy rooms:

On the cogwheel (settings) tab, in the Avatar section, set tight limits for Avatar Optimizations and Avatar Culling: