SculptJanuary is an annual online event that aims to encourage Blender users to sculpt more by providing them with 31 topics to complete during the month of January. It is organized by CG Boost.
There are no prizes involved, but it can make you a better sculptor.
In 2021 I had a lot of time available and I completed all 31 topics, although... not just in January... it was tough, I had to work a bit more in February until I finished everything.
Later, after finishing SculptJanuary, I made this (somewhat unusual) step-by-step video of sculpting the topic of that first day.