This might be of interest to TY students. If you had a classroom of students that discussed project ideas etc. That counts as participation! And if some students wanted, they could draw pictures of what they would make/design as solutions. Perhaps this would be a nice way to introduce it: students simply discuss it in a classroom with their teacher, and then in 2021, those students that would like to design a more detailed project (in written form on paper) could do so for the 2021 Challenge if they didn’t have time to participate in December.