After I finished working on my drawing, I spent some extra time on the event drawing small custom/abstract flags inspired from generated flags from my flag generator, placed on random locations of tiny available spaces on the canvas. Mainly just to help fill the canvas, but overall, that was a cool and fun idea.
I drew a total of 40 flags, but not all of them managed to survive until the end of the event. So, I double-checked and counted all the survived flags, and in total, there are 34 survived flags on the canvas. If you managed to find all of them, I'll reveal a huge list of locations in the comments!
These are some of the mini flags, for a bit of a hint.
A landscape version?