When creating an instance such as invite, invite+, Friends, Friends+ allow the instance owner to set a performance minimum so that users joining will be hidden by default if their avatar is below that minimum.
This will keep lag to a minimum at events as not everyone listens to the host (Community Meetups, World hops etc..) People can still show the avatar if they want but this way means they don't have to constantly mess with their safety features and it is nice and easy streamlined.