It can be difficult keeping up with SL visual arts events - there are so many around, but there's no need to troll the web searching for these any longer.
The SL Art Exhibit Schedule, found under the Events tab (above), is a handy resource for art lovers. It includes all the key exhibitions I'm aware of and is updated regularly. I hope it's helpful.
There's also a Submission form so you can have an art event added to the schedule - it might be one of your own or one I have missed.
Feel free to share this with anyone who may be interested :)