The Northampton tickets actually DID go onsale Tuesday morning with the majority of the other August presales. It was listed in a separate link above the others and wasn't properly working until around 10:30 am or so, but I was fortunate to double check just in case. Then Wednesday morning, The Iron Horse mailing list offered additional tix - which certainly didn't help anyone waiting until today.

Definitely thought there could have been more clarification about the initial presale, but oh well.

I assure you, the Calvin is not a particularly large venue, so there are still plenty of great seats available!