Top-down racing game with a small array of weapons to frustrate your opponents/
Go to "Multiplayer" -> "Online"
Then register a new account. You can ignore the email field. Use the nickname you'd like to use and set a password. This account will only exist for the event.
You'll get a message that your account has been registered and look for the verification email. There is no verification mail! That was disabled at the server side, so you can ignore that too.
Then log in with your newly created user account
Finally, to connect, click on "Play" and then "Join" and wait for the room to show up once the hosts opens it.