I've finally found some time to catch up on these forums, and I was a little surprised that nobody posted about the bat festival held at Indiana State University in Terre Haute, Indiana on September 13th. If they did, it didn't turn up in the search, and I apologize.
We were out that way and managed to catch a couple of the presentations on our way to spending some time in Indianapolis. I'm not sure how it compares to other bat festivals as it's our first one, but it was certainly worth the stop.
Some good information about bats in Indiana specifically and getting to see some live animals is always cool, especially some mega-bats up close because I'm pretty sure I'll never see them in the wild.