I think it's a good idea. It seems to have worked well so far. The open recs post gives people a chance to rec WIPs which otherwise might not get recced (or at least not for a very long time, until they're finished).

And the open recs weekend has been used nicely, without flooding the community with posts but still giving people who would like to rec one or two things in a month the ability to post without committing to make as many recs as an official monthly reccer, or if the monthly reccer positions were all filled then other people can still use the open weekends to rec their favorites.