Sorry for the really late response, I'm just working through all of recent the suggestions now.
a doctor who month would be great
We're trying to make the themes as generalised as possible to ensure that everyone can take part even if they've not heard of the specifics required for the general theme (items and quests might be more specific though). As such I'm not sure whether a Doctor Who month would work in that sense, I will however bring this theme up when we're next planning out the themes. Thanks for the suggestion.