May I suggest subscribing to the challenge page so that every time a host posts information that it shows up in your email. I do agree that some hosts could post on the challenge page on a more regular basis so it's easier to find the information. Since the challenges have different tag styles, it sure would be helpful if a couple of the recurring challenges, at minimum, listed a month's worth of tags for those of us who don't participate every week.
Keep in mind that the hosts are volunteers and are often hosting a challenge for the first time, doing their best. Perhaps, there could be a few mentors (previous hosts) to help first time hosts navigate postings and communication with members.