Speakers

You can join the meeting by PC/Mac in a web browser by going to meet.google.com/pub-xcqm-wct

If you don't have a webcam, you can still participate by clicking "Join and use a phone for audio". You will be given two options:

"Call Me" - where you can enter your phone number and receive a call to join the meeting
or
"Dial-in" - where you will be given a telephone number to call and a PIN# to enter the meeting

Using a telephone for audio without a webcam, you will be able to see other participants that do have video. 

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You can also join the meeting on Android/iOS by installing the app...
Android
Apple
After installation, go to meet.google.com/pub-xcqm-wct

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You can join the meeting by telephone by calling 423-657-0222 and entering the PIN: ‪281 378 999#

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Hangouts Meet Cheat Sheet: support.google.com/a/users/answer/9300131