Brickworld Indy is coming to the Indianapolis convention center March 13 & 14. Although it specifies in the footnotes that it is not an AFOL-exclusive convention, it looks to be partially supported by IndyLUG and the folks who put on Brickworld Chicago.
There will be several interactive events and 10,000 square feet of displays and vendors, but no classes or contests. It looks like the folks from BrickForge will be one of the vendors along with several others. It might be an opportunity to get some custom goodness without having to pay shipping and handling.
Adults are $8, kids 3 to 10 are $5, and kids under 3 are free.
In my experience these types of events are hard to come by. If you are in the area, I would recommend checking it out.