Have you guys considered doing a series of lessons on each of the prefectures in Japan? Japan is a surprisingly diverse country and it would be nice to hear a little about that.
I know the dialect class was sort of like this, but It might be interesting if you could talk about each prefecture in Japan and some stuff that the prefecture is well known for. The contents could include meibutsu, celebrities, or places. Since you guys are based out of Tokyo, it should be relatively easy to find people to come in and talk about their home prefectures.