MANGACON

In the organizer's words:

MANGACON is the convention for manga-ka, illustrators, cosplayers, game designers and content creators who love and celebrate the medium of manga and anime. On January 25 and 26 from 11 a.m. to 6 p.m. at the NRW-Forum, you can look forward to various digital and analog workshops, a cosplay walk and competition, signing sessions and talks by professional manga-ka and artists.
On Saturday, January 25, there will also be an after-show party from 6 to 10 pm. Admission is free of charge.

You can find more information about the program here.