There is every week a new link with the number of the actual week. Last week it was no. 33 - https://steemit.com/beersaturday/@detlev/join-the-steemit-beersaturday-challenge-week-33-schnapszahl-and-win-from-15-sdb - and you find this always on Tuesday on my blog.

But with the hashtag #beersaturday you might find this as well