You can allow unknown users to view your Virtual event via a generic link or by clicking the Virtual event banner on your event site.
When "public view" is enabled, users that are not logged in will be provided a "read only" view, with button(s) provided to register to participate. Buttons link to the signup form or ticket sales (if virtual event is restricted to ticketed guests only).
To Enable Public View:
Go to: Admin > Site Settings > Virtual Event > General
Important! If your viewer count approaches 350 - and you notice the quality of your livestream degrading - you'll want to disable public access to preserve the livestream quality for signed in supporters. Disabling public access will disconnect all users that are not signed in - so an announcement is warranted, to allow public users an opportunity to sign up before being disconnected.