I didn't know this section existed until ursus_of_unrv mentioned it to me, but it might be worth checking out. Also, it could potentially be a section that could use some 'beefing up' on the Celtic and Romano-Celtic content. I thought I'd point it out to you guys in case there was some interest. Click here for to access the section: UNRV Celtic & Germanic Culture.
If you know of any other communities that you want to share with the group please do!