Originally Posted by Kira-hime
Plus, I'll have a train pass for the time I'm there so I can go to other cities
that's quite good. but are you sure you can go with intercity (IC) and intercity express (ICE) trains as well? would be great if it's not local public transport ticket only.
as nayara said. the only bigger conventions are hanami, dokomi, japantag and chiisai con. i guess hanami and chiisai con would be quite a problem. and i can't tell a thing about them. i havn't been there myself.
traveling to düsseldorf for dokomi or japantag... hm, it's quite a little long to go via train. it's about 3 1/2 till 4 hours (if you can travel via IC and ICE too) and since japantag is more a festival for promoting japanese culture than a normal anime and manga convention, that's only one day long, it's a bit heavy to travel that far. especially because the great firework show starts at 11 p.m. i guess you have to go earlier to make sure you can return home.
dokomi is held in a school building in a "outer district" of düsseldorf. it's on a saturday and sunday. it's the same time of traveling with some minutes additional to get to düsseldorf reißholz (the name of the city district). it's sure far away from the dimensions animagic and connichi would give. but last year was the first dokomi, so they improved a lot, i guess. (for first try it was far over my expectations)
there was a maid cafe and this year they will have a host cafe (male version of maids) too. they have some workshops, a games room, maybe karaoke (not quite sure about this) and competitions for cosplayers and other artists. further last year preliminary for the german cosplay championship was held there. this year not only this preliminary will be held. they plan to hold the Euro Cosplay preliminary as well.
Maybe pictures help a little, because "convention in a school building" sounds really odd. Link
i hope you don't look at all the 25.000 pictures.
what to say else... you can check traveling options via www.bahn.de
from oldenburg to everywhere. but it's only works for two or three month in the future, for exaple today you can search till april or beginning of may. for later traveling dates you have to wait. they have an option for "local train transport only" too, if your ticket doesn't include IC and ICE.