DWTS has a Disney week including CGI cartoons and everything. It's a bit weird and twee to me.

I quite like the idea of a TV themes week but then again I don't know if we have enough iconic/well known suitable TV shows to do that. For instance DWTS does Game of Thrones, but I can't see the BBC going for that in a family show. So Halloween and Movies it is.

Although, as someone else suggested 80s could also work.