ArtRabbit seems to be a useful listings site for art events and galleries. I haven’t quite explored it all yet, but it seems to offer a very wide range of different art venues and experiences worldwide (though I have only looked in any detail at its UK listings). Also offered is a weekly news bulletin. Since one can set up ‘favourite’ venues and artists I am rather hopeful that this means I can in essence set up alerts for the venues and people that most interest me (of course, a genre/discipline/whatever alert of some kind would be of use, too). They also offer a smallish but seemingly growing number of feature reviews and events, with user comments contributing to the discussion. (A fully fledged forum would be another attraction but this is currently missing). http://www.artrabbit.com/all/home
I shall perhaps have more to say on ArtRabbit after I’ve sampled their newsletter and had a bit more of a prowl around.