There is no one definitive way to join a random Google Meet. However, there are a few methods that you can try.
One method is to join a friend or acquaintance's Meet. If you know someone who is already in a Meet, ask if you can join their session.
Another method is to join a public Meet. There are many online communities and forums that host public Meet sessions that anyone can join. Do a quick search online to see if there are any open Meet sessions that you can join.
Lastly, you can try joining a Meet through a third-party website or service. There are many sites that offer Meet services, and some of them may have open Meet sessions that you can join. Again, a quick online search should help you find these sites.