The cohort materials aren't locked. You get 2 full weeks to submit all assignments - from the Wednesday before the cohort starts until the Wednesday after it ends. [1]
If you can't complete the assignments within this timeframe, you can switch to a future cohort by submitting the Cohort Application Update form. Your progress will be saved.
The cohort is designed as an async experience, so you can work through the lessons and assignments at your own pace during the submission window. [2]
If you still need help with accessing the cohort materials or completing your assignments, I’m here to assist. Would you like to share more about what you’re trying to resolve or understand regarding the course?