I have the rules as I understand in my posts and this was the latest post:
https://steemit.com/monthlyauthorchallenge/@ace108/monthly-author-challenge-7-26-line-friends-cake-or-line-by-ace108
Otherwise, go to this latest one from @future24 :
https://steemit.com/monthlyauthorchallenge/@future24/steemit-m-a-c-by-future24-july-2018-day-25-celebrating-lex030-s-birthday-at-the-asado-steakhouse-restaurant-yesterday
Also worth looking is this one:
https://steemit.com/monthlyauthorchallenge/@steemit-mac/the-third-steemit-m-a-c-prize-pool-raising-post-for-july-2018?r=future24