If it's not too far away, the Superman Celebration in Metropolis, Illinois would be a great place to show off your costume. It's a bit more like a carnival or county fair than a comic convention but there are always tons of people in Superman cosplay and they tend to have some great guests. It looks like Erica Durance (Lois Lane), Margo Kidder (Lois Lane) and Sarah Douglas (Ursa) will be there this year.
Edit: By the way, that's Noel Neill down in front just to the right of the banner. When she was alive, she attended just about every Superman Celebration. They've since built a statue in her honor.