As we have discussed before, we don't have clear themes for most weeks so we can't announce one. We don't announce any information beforehand, unless there are specific criteria that you need to meet to be eligible, such as in the case of the social impact theme. Otherwise, the best way to participate is to publish Actors that meet the requirements of the challenge, and that week's guest judge will choose their favourite (we don't announce the guest judges in advance, so nobody can campaign them).