Discovered in a Livejournal

Oh no, it wouldn't be that you had to join in weekly, it's just that different challenges would be posted weekly (in the hope that if one didn't inspire someone, the next challenge might *g*). You could opt in monthly, or every two months, or just once out of all them - whatever suited you! And post it to the comm whenever (or at least until the challenges stopped, which would definitely be December, if not earlier.