All the courses have activities that need to be completed by a specific deadline that is more than generous. You have 3 weeks to participate in a Practical Application once it is assigned to you.

Unfortunately, we cannot extend the deadline for a specific Practical Application because this would affect the whole Course Schedule of the Student Series you are part of and this can affect hundred or thousand of students. 

So, once missed a deadline you cannot participate in that activity anymore. Focus on the further activities and do your best not to miss another deadline.