Superb compilation! Thanks for listing these and organizing them so well. FYI, a new community challenge launched just this morning: Steemit Vision Quest. These are the details:

Conducted by @cabelindsay. Express yourself creatively with an original artwork that helps us to visualize the weekly theme. This first week's theme is: "Sky Meets Sea".

Start day: 29.01.18
End day: 04.01.18
Prize pool: 100% of SBD earned from the post payout. The Top 11 participants will split the reward.