Each day there will be a lesson released at 7am (UK). It's a 20-minute video (which you can listen to like a podcast if you prefer).
There's a thread in the challenge group in which you can write all of your questions.
Each evening there's a live Q&A in which Sarah will answer all the questions that are asked. This usually lasts around 60 minutes.
At the end of each day there's a recording of both events sent out by email. By the end of the week, you'll have a complete recording of all 4 days' classes and all 4 days' Q&As.