There's another EyeCon event in Wilmington this May. For the first time, Sophia Bush is attending one in the US. As of right now, they have also confirmed Robert Buckley and Ashley Rickards. They say more guests will be confirmed soon, but imo, it's getting a little late. I think they usually have a lot more guests confirmed by this point.
The Inside OTH people, organized by the local crew of the show, are/were planning another fan experience, but nothing has been announced yet. Theirs looked amazing last year. I was in town while it was being held and it looked like a lot of "up close and personal" experiences with the cast. If they post anything about another event this year, I'll start a new thread for that one.