If you were invited to the event in Spatial Chat, you would get the mail like this:
There will be the link to the Space you need. But this link is valid only once - for the first entering. If you try to use this link next time, you'll see this message:
To enter the Space for the second time and beyond, you need to log in to the https://spatial.chat page through your email, to which you previously received an invitation.
After that, you will see this window:
You can find your login code in the email, which you will receive:
After login, you will see your user account page, where you can enter the last visited Spaces, create your own Team and Space and change your profile and account settings.
You can also ask the event admin to send you the straight link to your event. It looks like this: