I have been asked to promote Gamehole Con in some way, though I won't be able to make it this year (it falls just before U-Con, which will have a full OSR Track this year. More on that this weekend.) What I will do is say that it looks to have quite a few good OSR events. I would love to attend the TSR with Gary seminar with Frank Mentzer and the Q&A with the +Stephen Chenault. Here is the entire Gamehole Con Event Listing.