There is an awesome group on Tumblr to be found here: [link]
They are attempting to put together a Tumblr convention that is run by and for Tumblr users! Currently one is scheduled for July 18-20th 2014 in Chicago, Illinois!
But there is still some fundraising to be done towards the event! And so the Avengers/Marvel committee is looking for artists to work on commissions for those who donate!
It's a great opportunity to get your name out there, especially if you like doing art for others and enjoy the comic scene in general.
If you're interested please check out their Tumblr here: [link]
And send an e-mail here: avengerscommittee@yahoo[.]com
And have fun!