Replays depend on the class
Some free classes and events have a replay, and some are live-only. If a class has a replay, the sign-up page shows it, along with how long it stays up and where to watch it. You'll also find this in your registration email.
If the sign-up page doesn't mention a replay, the class is live-only, so it's worth blocking the time if you want to attend.
What about paid programs?
Live coaching sessions that are part of a paid program or membership work differently. Those sessions come with replay access as part of what you bought.
Not sure about a specific class?
Reply with the name of the class and we'll confirm whether it has a replay.