I've think part of the source of confusion is that there are two sets of instructions, one for hosts of the Weekly Art Event (that's what is in the "Instructions" thread in the All Media Events Forum) and instructions for a participant in the Weekly Art Event. Hopefully, anyone who decides to host would have participated at least once and understand how it works.
Participant instructions will be at the beginning of each Weekly Art Event thread. Let's focus there first and make sure they are clear.
Sample Weekly Post starting with Participant Instructions
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Thread Title: Weekly Art Event (Nov 5, 2021 - Nov 11, 2021)
First Post in Thread:
The prompt for this week is
School
Create some art that is suggested to you by this week's prompt. All media and styles are welcome (drawing, painting, digital, photography, sculpture, multi-media, representational, abstract, etc.). It can be a rough sketch, a finished work of art, or anything in between. It can be created from your imagination, life or a photo reference (if you use an image from the Internet, be sure it is not copyrighted.)
Post your art in this thread.
Post any time during the week (or later if you don't get it finished on time!) Along with the art you have posted, you can tell us a little about it. For example, you could include the medium you used, where you got your inspiration or how long it took. You can post as many times as you would like, it's entirely up to you. When you post, also like or comment on posts made earlier in the thread by other artists. We all like acknowledgement of our work!